ci: publish image for Apple M2 architecture

Author: lalver1

.github/workflows/docker-publish.yml

@@ -74,7 +74,7 @@ jobs:
       - name: Build, tag, and push image to GitHub Container Registry
         uses: docker/build-push-action@v6
         with:
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64,linux/arm64,linux/arm64/v8
           builder: ${{ steps.buildx.outputs.name }}
           build-args: GIT-SHA=${{ github.sha }}
           cache-from: type=gha,scope=cal-itp