Build the image for amd64 and arm64 platforms

Author: andrewn617

.github/workflows/build-and-publish-images.yaml

@@ -49,6 +49,7 @@ jobs:
         with:
           imageName: ghcr.io/rails/devcontainer/images/ruby
           cacheFrom: ghcr.io/rails/devcontainer/images/ruby
-          imageTag: 0.2.0-${{ matrix.RUBY_VERSION }},${{ matrix.RUBY_VERSION }}
+          imageTag: 0.3.0-${{ matrix.RUBY_VERSION }},${{ matrix.RUBY_VERSION }}
           subFolder: images/ruby
-          push: always
+          push: always
+          platform: linux/arm64,linux/amd64