Mathias Beaulieu-Duncan 843184da33 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>

2026-02-03 15:32:02 -05:00

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.NET Docker Images

Minimal .NET Docker images for production and CI/CD. Built on Wolfi, a security-focused Linux distribution designed for containers. All supported (non-EOL) .NET versions are rebuilt automatically.

Images

Version				Arch	EOL

Variants

Variant	Includes	Shell	ICU/Globalization	User
runtime	ASP.NET Core runtime	No	Yes	65532 (nonroot)
runtime-invariant	ASP.NET Core runtime	No	No (invariant mode)	65532 (nonroot)
sdk	.NET SDK + bash, git, curl	Yes (bash)	Yes	root

runtime - Full globalization support (ICU + tzdata). Use this for apps that need locale-aware formatting, time zones, or culture-specific behavior.
runtime-invariant - No ICU or tzdata. Smallest image size. Use this for APIs that only need UTC and ordinal string comparison.
sdk - Everything needed to build .NET apps. Runs as root so dotnet restore can write to global caches.

Why Wolfi?

Wolfi is a lightweight Linux distribution built specifically for containers. It provides:

Minimal footprint - Only essential packages, nothing extra
Daily security updates - Patches applied quickly
Designed for containers - No legacy cruft from traditional distros

Features

Lightweight - Optimized for fast CI/CD pulls
Secure - Built on Wolfi with continuous vulnerability scanning
Multi-arch - Supports both linux/amd64 and linux/arm64
Non-root - Runtime images run as unprivileged user (UID 65532)
Supply chain security - SBOM and SLSA provenance attestations included
EOL-aware - Versions are automatically dropped when they reach end-of-life

Dockerfile Examples

Web API (recommended)

ARG BUILDPLATFORM
FROM --platform=$BUILDPLATFORM svrnty/dotnet:sdk-10 AS build

WORKDIR /source
COPY . .
WORKDIR /source/MyApp.Api

ARG TARGETARCH
RUN case "$TARGETARCH" in \
      amd64) ARCH=x64 ;; \
      arm64) ARCH=arm64 ;; \
      *) ARCH=$TARGETARCH ;; \
    esac && \
    dotnet publish -a $ARCH --self-contained false -o /app

FROM svrnty/dotnet:runtime-invariant-10 AS final
WORKDIR /app
COPY --from=build /app .
USER 65532
EXPOSE 8080
ENTRYPOINT ["/usr/share/dotnet/dotnet", "MyApp.Api.dll"]

Web API with globalization (ICU)

ARG BUILDPLATFORM
FROM --platform=$BUILDPLATFORM svrnty/dotnet:sdk-lts AS build

WORKDIR /source
COPY . .

ARG TARGETARCH
RUN case "$TARGETARCH" in \
      amd64) ARCH=x64 ;; \
      arm64) ARCH=arm64 ;; \
      *) ARCH=$TARGETARCH ;; \
    esac && \
    dotnet publish MyApp.sln -a $ARCH --self-contained false -o /app

FROM svrnty/dotnet:runtime-lts AS final
WORKDIR /app
COPY --from=build /app .
USER 65532
EXPOSE 8080
ENTRYPOINT ["/usr/share/dotnet/dotnet", "MyApp.dll"]

Worker service

ARG BUILDPLATFORM
FROM --platform=$BUILDPLATFORM svrnty/dotnet:sdk-10 AS build

WORKDIR /source
COPY . .

ARG TARGETARCH
RUN case "$TARGETARCH" in \
      amd64) ARCH=x64 ;; \
      arm64) ARCH=arm64 ;; \
      *) ARCH=$TARGETARCH ;; \
    esac && \
    dotnet publish MyWorker -a $ARCH --self-contained false -o /app

FROM svrnty/dotnet:runtime-invariant-10 AS final
WORKDIR /app
COPY --from=build /app .
USER 65532
ENTRYPOINT ["/usr/share/dotnet/dotnet", "MyWorker.dll"]

CI/CD (Gitea/GitHub Actions)

jobs:
  build:
    runs-on: ubuntu-latest
    container:
      image: svrnty/dotnet:sdk-lts
    steps:
      - uses: actions/checkout@v4
      - run: dotnet restore
      - run: dotnet test --no-restore
      - run: dotnet publish -c Release -o /app

Automatic Updates

Images are automatically rebuilt when:

New .NET patch versions are released (daily check)
Base image security updates are available (weekly rebuild)
A .NET version reaches EOL, it is automatically excluded

Every build is scanned with Docker Scout and includes supply chain attestations (SBOM, SLSA provenance).

License

MIT

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