feat(docker-publish): pure Docker build + gradle-docker-context producer

[TheMeinerLP]

Goal

Separate the Gradle toolchain from the Docker build so docker-publish.yml is a pure, generic Docker build usable by any project (Flutter, Node, Go, plain multi-stage Dockerfiles) — not just Gradle-produced contexts.

Changes

docker-publish.yml — now pure

• Removed all JDK/Gradle steps and the build-command / build-env / setup-java / java-version / java-distribution inputs.
• Added artifact-name: optionally download a pre-built context (uploaded by an upstream job in the same run) into context before building.
• Context source is now either the checked-out repo (self-contained Dockerfile) or an artifact. No language/build step remains.

gradle-docker-context.yml — new reusable producer

• Sets up JDK + Gradle, exposes the private OneLiteFeather Maven credentials as env (same convention as gradle-publish.yml).
• Runs a gradle-command (e.g. ./gradlew jar optimizedBuildLayers optimizedDockerfile -Pversion=$VERSION) to generate the Docker context.
• Uploads context-path as an artifact for docker-publish to consume.

Caller pattern

build-context:
  uses: OneLiteFeatherNET/workflows/.github/workflows/gradle-docker-context.yml@v2.3.0
  with:
    version: "1.2.3"
    gradle-command: "./gradlew jar optimizedBuildLayers optimizedDockerfile -Pversion=$VERSION"
    context-path: "build/docker/optimized"
    artifact-name: "docker-context-1.2.3"
  secrets: inherit

docker:
  needs: build-context
  uses: OneLiteFeatherNET/workflows/.github/workflows/docker-publish.yml@v2.3.0
  with:
    image-name: "onelitefeather/foo"
    version: "1.2.3"
    context: "build/docker/optimized"
    artifact-name: "docker-context-1.2.3"
  secrets: inherit

Non-Gradle (e.g. Flutter, multi-stage Dockerfile) skips the producer entirely:

docker:
  uses: OneLiteFeatherNET/workflows/.github/workflows/docker-publish.yml@v2.3.0
  with:
    image-name: "onelitefeather/foo"
    version: "1.2.3"
    context: "./"
  secrets: inherit

⚠️ Breaking

docker-publish.yml drops setup-java / build-command / build-env. Callers using those (Otis, Vulpes-Backend) are migrated to the producer pattern in their own PRs and must move together with the v2.3.0 bump.

🤖 Generated with Claude Code