Build Ruby images for multiple versions (#1)

Co-authored-by: Patrik Ragnarsson <patrik@starkast.net>

Author: baelter

.github/workflows/ruby.yml

@@ -20,6 +20,12 @@ jobs:
     permissions:
       contents: read
       packages: write
+    strategy:
+      matrix:
+        ruby-version:
+          - "3.3.10"
+          - "3.4.8"
+          - "4.0.1"
     steps:
       - uses: actions/checkout@v6
 
@@ -30,17 +36,9 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: docker/metadata-action@v6
-        id: meta
-        with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          tags: |
-            type=raw,value=latest,enable={{is_default_branch}}
-            type=sha
-
       - uses: docker/build-push-action@v7
         with:
           context: ruby
+          build-args: RUBY_VERSION=${{ matrix.ruby-version }}
           push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.ruby-version }}