Auto-update README version tables from .NET release metadata

The daily update-check pipeline now regenerates the images table,
EOL dates, and .NET badge in README.md and DOCKERHUB.md from the
Microsoft releases-index.json API. Commits changes only when the
supported version set changes.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/update-check.yaml

@@ -33,34 +33,132 @@ jobs:
           # Filter active/go-live versions (excludes EOL automatically)
           SUPPORTED=$(echo "$RELEASES" | jq -c '[.["releases-index"][] | select(.["support-phase"] == "active" or .["support-phase"] == "go-live")]')
 
-          NEEDS_BUILD=false
+          # Find highest LTS and STS majors
+          LTS_MAJOR=$(echo "$SUPPORTED" | jq -r '[.[] | select(.["release-type"] == "lts")] | sort_by(.["channel-version"] | split(".") | map(tonumber)) | last | .["channel-version"] | split(".")[0]')
+          STS_MAJOR=$(echo "$SUPPORTED" | jq -r '[.[] | select(.["release-type"] == "sts")] | sort_by(.["channel-version"] | split(".") | map(tonumber)) | last | .["channel-version"] | split(".")[0] // ""')
 
-          echo "$SUPPORTED" | jq -r '.[] | "\(.["channel-version"]) \(.["latest-runtime"]) \(.["latest-sdk"]) \(.["release-type"])"' | \
+          # Export for later steps
+          echo "supported=$SUPPORTED" >> $GITHUB_OUTPUT
+          echo "lts_major=$LTS_MAJOR" >> $GITHUB_OUTPUT
+          echo "sts_major=$STS_MAJOR" >> $GITHUB_OUTPUT
+
+          # Check if any new images need building
+          NEEDS_BUILD=false
           while read -r CHANNEL RUNTIME SDK TYPE; do
             MAJOR=$(echo "$CHANNEL" | cut -d. -f1)
             echo "Checking .NET $MAJOR: runtime=$RUNTIME sdk=$SDK type=$TYPE"
 
-            # Check if runtime image for this exact version exists
+            if ! docker manifest inspect "$DOCKER_IMAGE:runtime-$RUNTIME" > /dev/null 2>&1; then
-            if docker manifest inspect "$DOCKER_IMAGE:runtime-$RUNTIME" > /dev/null 2>&1; then
-              echo "  Image runtime-$RUNTIME already exists, skipping"
-            else
               echo "  New version detected: runtime-$RUNTIME"
               NEEDS_BUILD=true
-            fi
-          done
-
-          # Re-check outside the pipe (subshell issue)
-          NEEDS_BUILD=false
-          while read -r CHANNEL RUNTIME SDK TYPE; do
-            MAJOR=$(echo "$CHANNEL" | cut -d. -f1)
-            if ! docker manifest inspect "$DOCKER_IMAGE:runtime-$RUNTIME" > /dev/null 2>&1; then
-              NEEDS_BUILD=true
               break
+            else
+              echo "  Image runtime-$RUNTIME already exists, skipping"
             fi
           done < <(echo "$SUPPORTED" | jq -r '.[] | "\(.["channel-version"]) \(.["latest-runtime"]) \(.["latest-sdk"]) \(.["release-type"])"')
 
           echo "needs_build=$NEEDS_BUILD" >> $GITHUB_OUTPUT
 
+      - name: Update README version tables
+        id: readme
+        run: |
+          set -euo pipefail
+
+          SUPPORTED='${{ steps.check.outputs.supported }}'
+          LTS_MAJOR="${{ steps.check.outputs.lts_major }}"
+          STS_MAJOR="${{ steps.check.outputs.sts_major }}"
+
+          ARCH_BADGES='<img src="https://img.shields.io/badge/amd64-E65100" alt="amd64"> <img src="https://img.shields.io/badge/arm64-2e7d32" alt="arm64">'
+
+          # Build version rows from API data (sorted by major descending)
+          README_ROWS=""
+          DOCKERHUB_ROWS=""
+          BADGE_VERSIONS=""
+
+          echo "$SUPPORTED" | jq -r 'sort_by(.["channel-version"] | split(".") | map(tonumber)) | reverse | .[] | "\(.["channel-version"]) \(.["latest-runtime"]) \(.["latest-sdk"]) \(.["release-type"]) \(.["eol-date"] // "TBD")"' | \
+          while read -r CHANNEL RUNTIME SDK TYPE EOL; do
+            MAJOR=$(echo "$CHANNEL" | cut -d. -f1)
+
+            # Version label
+            if [ "$TYPE" = "lts" ]; then
+              LABEL="**.NET ${MAJOR}** (LTS)"
+            elif [ "$TYPE" = "sts" ]; then
+              LABEL="**.NET ${MAJOR}** (STS)"
+            else
+              LABEL="**.NET ${MAJOR}**"
+            fi
+
+            # Floating tags only for highest LTS/STS
+            if [ "$MAJOR" = "$LTS_MAJOR" ]; then
+              RT_TAGS="\`runtime-${MAJOR}\` \`runtime-lts\`"
+              RI_TAGS="\`runtime-invariant-${MAJOR}\` \`runtime-invariant-lts\`"
+              SDK_TAGS="\`sdk-${MAJOR}\` \`sdk-lts\`"
+            elif [ "$MAJOR" = "$STS_MAJOR" ]; then
+              RT_TAGS="\`runtime-${MAJOR}\` \`runtime-sts\`"
+              RI_TAGS="\`runtime-invariant-${MAJOR}\` \`runtime-invariant-sts\`"
+              SDK_TAGS="\`sdk-${MAJOR}\` \`sdk-sts\`"
+            else
+              RT_TAGS="\`runtime-${MAJOR}\`"
+              RI_TAGS="\`runtime-invariant-${MAJOR}\`"
+              SDK_TAGS="\`sdk-${MAJOR}\`"
+            fi
+
+            echo "| ${LABEL} | ${RT_TAGS} | ${RI_TAGS} | ${SDK_TAGS} | ${ARCH_BADGES} | ${EOL} |" >> /tmp/readme_rows.txt
+            echo "| ${LABEL} | ${RT_TAGS} | ${RI_TAGS} | ${SDK_TAGS} | amd64 arm64 | ${EOL} |" >> /tmp/dockerhub_rows.txt
+            echo -n "${MAJOR} " >> /tmp/badge_versions.txt
+          done
+
+          README_ROWS=$(cat /tmp/readme_rows.txt)
+          DOCKERHUB_ROWS=$(cat /tmp/dockerhub_rows.txt)
+          BADGE_VERSIONS=$(cat /tmp/badge_versions.txt | xargs | sed 's/ /%20|%20/g')
+
+          # Update README.md — version table
+          awk '
+            /<!-- BEGIN_VERSION_TABLE -->/ { print; found=1; next }
+            /<!-- END_VERSION_TABLE -->/ { found=0 }
+            found { next }
+            { print }
+          ' README.md > /tmp/readme_new.md
+          # Insert new rows after BEGIN marker
+          awk -v rows="$README_ROWS" '
+            /<!-- BEGIN_VERSION_TABLE -->/ { print; print rows; next }
+            { print }
+          ' /tmp/readme_new.md > README.md
+
+          # Update README.md — .NET badge
+          sed -i "s|<!-- BEGIN_DOTNET_BADGE -->.*<!-- END_DOTNET_BADGE -->|<!-- BEGIN_DOTNET_BADGE --><a href=\"https://dotnet.microsoft.com\" target=\"_blank\"><img src=\"https://img.shields.io/badge/.NET-${BADGE_VERSIONS}-512BD4?logo=dotnet\" alt=\".NET\"></a><!-- END_DOTNET_BADGE -->|" README.md
+
+          # Update DOCKERHUB.md — version table
+          awk '
+            /<!-- BEGIN_VERSION_TABLE -->/ { print; found=1; next }
+            /<!-- END_VERSION_TABLE -->/ { found=0 }
+            found { next }
+            { print }
+          ' DOCKERHUB.md > /tmp/dockerhub_new.md
+          awk -v rows="$DOCKERHUB_ROWS" '
+            /<!-- BEGIN_VERSION_TABLE -->/ { print; print rows; next }
+            { print }
+          ' /tmp/dockerhub_new.md > DOCKERHUB.md
+
+          # Check if anything changed
+          if git diff --quiet README.md DOCKERHUB.md; then
+            echo "readme_changed=false" >> $GITHUB_OUTPUT
+            echo "READMEs are up to date"
+          else
+            echo "readme_changed=true" >> $GITHUB_OUTPUT
+            echo "READMEs need updating"
+            git diff README.md DOCKERHUB.md
+          fi
+
+      - name: Commit README updates
+        if: steps.readme.outputs.readme_changed == 'true'
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add README.md DOCKERHUB.md
+          git commit -m "Update supported .NET versions in README"
+          git push
+
       - name: Trigger build workflow
         if: steps.check.outputs.needs_build == 'true'
         uses: actions/github-script@v7

DOCKERHUB.md

@@ -9,9 +9,11 @@ Minimal .NET Docker images for production and CI/CD. Built on [Wolfi](https://wo
 
 | Version | `runtime` | `runtime-invariant` | `sdk` | Arch | EOL |
 |---------|-----------|---------------------|-------|------|-----|
+<!-- BEGIN_VERSION_TABLE -->
 | **.NET 10** (LTS) | `runtime-10` `runtime-lts` | `runtime-invariant-10` `runtime-invariant-lts` | `sdk-10` `sdk-lts` | amd64 arm64 | 2028-11-14 |
 | **.NET 9** (STS) | `runtime-9` `runtime-sts` | `runtime-invariant-9` `runtime-invariant-sts` | `sdk-9` `sdk-sts` | amd64 arm64 | 2026-11-10 |
 | **.NET 8** | `runtime-8` | `runtime-invariant-8` | `sdk-8` | amd64 arm64 | 2026-11-10 |
+<!-- END_VERSION_TABLE -->
 
 ## Variants
 

README.md

@@ -3,7 +3,7 @@
 <a href="https://git.openharbor.io/svrnty/docker-dotnet" target="_blank"><img src="https://img.shields.io/badge/Git-Repository-orange?logo=gitea" alt="Git Repository"></a>
 <a href="https://hub.docker.com/r/svrnty/dotnet" target="_blank"><img src="https://img.shields.io/badge/Docker%20Hub-svrnty%2Fdotnet-blue?logo=docker" alt="Docker Hub"></a>
 <a href="https://hub.docker.com/r/svrnty/dotnet" target="_blank"><img src="https://img.shields.io/docker/pulls/svrnty/dotnet?logo=docker" alt="Docker Pulls"></a>
-<a href="https://dotnet.microsoft.com" target="_blank"><img src="https://img.shields.io/badge/.NET-10%20|%209%20|%208-512BD4?logo=dotnet" alt=".NET"></a>
+<!-- BEGIN_DOTNET_BADGE --><a href="https://dotnet.microsoft.com" target="_blank"><img src="https://img.shields.io/badge/.NET-10%20|%209%20|%208-512BD4?logo=dotnet" alt=".NET"></a><!-- END_DOTNET_BADGE -->
 <a href="https://wolfi.dev" target="_blank"><img src="https://img.shields.io/badge/Base-Wolfi-purple?logo=linux" alt="Wolfi"></a>
 
 Minimal .NET Docker images for production and CI/CD. Built on [Wolfi](https://wolfi.dev), a security-focused Linux distribution designed for containers. All supported (non-EOL) .NET versions are rebuilt automatically.
@@ -12,9 +12,11 @@ Minimal .NET Docker images for production and CI/CD. Built on [Wolfi](https://wo
 
 | Version | <a href="https://hub.docker.com/r/svrnty/dotnet/tags?name=runtime-" target="_blank"><img src="https://img.shields.io/badge/runtime-blue?logo=docker" alt="runtime"></a> | <a href="https://hub.docker.com/r/svrnty/dotnet/tags?name=runtime-invariant-" target="_blank"><img src="https://img.shields.io/badge/runtime--invariant-blue?logo=docker" alt="runtime-invariant"></a> | <a href="https://hub.docker.com/r/svrnty/dotnet/tags?name=sdk-" target="_blank"><img src="https://img.shields.io/badge/sdk-blue?logo=docker" alt="sdk"></a> | Arch | EOL |
 |---------|---------|-------------------|-----|------|-----|
+<!-- BEGIN_VERSION_TABLE -->
 | **.NET 10** (LTS) | `runtime-10` `runtime-lts` | `runtime-invariant-10` `runtime-invariant-lts` | `sdk-10` `sdk-lts` | <img src="https://img.shields.io/badge/amd64-E65100" alt="amd64"> <img src="https://img.shields.io/badge/arm64-2e7d32" alt="arm64"> | 2028-11-14 |
 | **.NET 9** (STS) | `runtime-9` `runtime-sts` | `runtime-invariant-9` `runtime-invariant-sts` | `sdk-9` `sdk-sts` | <img src="https://img.shields.io/badge/amd64-E65100" alt="amd64"> <img src="https://img.shields.io/badge/arm64-2e7d32" alt="arm64"> | 2026-11-10 |
 | **.NET 8** | `runtime-8` | `runtime-invariant-8` | `sdk-8` | <img src="https://img.shields.io/badge/amd64-E65100" alt="amd64"> <img src="https://img.shields.io/badge/arm64-2e7d32" alt="arm64"> | 2026-11-10 |
+<!-- END_VERSION_TABLE -->
 
 ## Variants