wip: pipeline to publish image snapshots

Author: flavorjones

.github/workflows/publish-images.yml

@@ -7,5 +7,55 @@ on:
 
 jobs:
   build:
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          # - x86-mingw32
+          # - x64-mingw-ucrt
+          # - x64-mingw32
+          # - x86-linux
+          - x86_64-linux
+          # - x86_64-darwin
+          # - arm64-darwin
+          # - arm-linux
+          # - aarch64-linux
+          # - jruby
+    runs-on: ubuntu-latest
+    env:
+      DOCKERHUB_USER: rake-compiler
     steps:
-      - run: echo "this is a stub pipeline so that I can ship a working version in #84"
+      - uses: actions/checkout@v3
+      - name: Cache Docker layers
+        uses: actions/cache@v3
+        with:
+          path: tmp/build-cache
+          key: ${{ runner.os }}-${{ matrix.platform }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-${{ matrix.platform }}-buildx
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.0"
+          bundler-cache: true
+      - id: rcd_image_version
+        run: bundle exec ruby -e 'require "rake_compiler_dock"; puts "rcd_image_version=#{RakeCompilerDock::IMAGE_VERSION}"' >> $GITHUB_OUTPUT
+      - name: Build docker image
+        run: |
+          docker buildx create --driver docker-container --use
+          bundle exec rake build:${{ matrix.platform }} RCD_DOCKER_BUILD="docker buildx build --cache-from=type=local,src=tmp/build-cache --cache-to=type=local,dest=tmp/build-cache-new --load"
+      - name: Move build cache and remove outdated layers
+        run: |
+          rm -rf tmp/build-cache
+          mv tmp/build-cache-new tmp/build-cache
+      - uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{github.actor}}
+          password: ${{secrets.GITHUB_TOKEN}}
+      - run: |
+          docker images
+          docker tag \
+            rake-compiler/rake-compiler-dock-mri-${{matrix.platform}}:${{steps.rcd_image_version.outputs.rcd_image_version}} \
+
+            ghcr.io/rake-compiler/rake-compiler-dock-snapshot:mri-${{matrix.platform}}
+          docker push ghcr.io/rake-compiler/rake-compiler-dock-snapshot:mri-${{matrix.platform}}