Add workflow to auto-sync README badges with Dockerfile versions

Automatically updates Android SDK version badge when Dockerfile changes.

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

.gitea/workflows/sync-readme-badges.yaml

@@ -0,0 +1,58 @@
+name: Sync README Badges
+
+on:
+  push:
+    paths:
+      - 'Dockerfile.android'
+      - 'Dockerfile'
+      - 'Dockerfile.linux'
+  workflow_dispatch:
+
+jobs:
+  sync-badges:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Extract versions from Dockerfiles
+        id: versions
+        run: |
+          # Android SDK build-tools version
+          ANDROID_SDK=$(grep -oP 'ANDROID_BUILD_TOOLS=\K[0-9.]+' Dockerfile.android || echo "")
+          echo "android_sdk=${ANDROID_SDK}" >> $GITHUB_OUTPUT
+          echo "Android SDK: ${ANDROID_SDK}"
+
+          # Flutter version (from ARG default)
+          FLUTTER=$(grep -oP 'ARG FLUTTER_VERSION=\K[0-9.]+' Dockerfile.android || echo "")
+          echo "flutter=${FLUTTER}" >> $GITHUB_OUTPUT
+          echo "Flutter: ${FLUTTER}"
+
+      - name: Update README badges
+        run: |
+          ANDROID_SDK="${{ steps.versions.outputs.android_sdk }}"
+          FLUTTER="${{ steps.versions.outputs.flutter }}"
+
+          if [ -n "$ANDROID_SDK" ]; then
+            # Update Android SDK badge version
+            sed -i "s|Android%20SDK-[0-9.]*-green|Android%20SDK-${ANDROID_SDK}-green|g" README.md
+            echo "Updated Android SDK badge to ${ANDROID_SDK}"
+          fi
+
+      - name: Check for changes
+        id: changes
+        run: |
+          if git diff --quiet README.md; then
+            echo "changed=false" >> $GITHUB_OUTPUT
+          else
+            echo "changed=true" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Commit and push
+        if: steps.changes.outputs.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
+          git commit -m "Update README badges to match Dockerfile versions"
+          git push