Refactor GitHub Actions to use a reusable build workflow

.github/workflows/build.yaml

@@ -1,10 +1,12 @@
 name: Build container image
 on:
   pull_request:
+  push:
+    tags:
+      - '*'
 
 env:
   IMAGE_NAME: ${{ github.event.repository.name }}
-  IMAGE_TAGS: ${{ github.sha }}
 
 jobs:
   build:
@@ -25,8 +27,18 @@ jobs:
         uses: redhat-actions/buildah-build@v2
         with:
           image: ${{ env.IMAGE_NAME }}
-          tags: ${{ env.IMAGE_TAGS }}
+          tags: ${{ github.event_name == 'pull_request' && github.sha || github.ref_name }}
           archs: amd64, arm64, ppc64le, riscv64, s390x
           containerfiles: |
             ./Dockerfile
 
+      - name: Push To Registry
+        if: github.event_name == 'push' && github.ref_type == 'tag'
+        uses: redhat-actions/push-to-registry@v2
+        id: push_image
+        with:
+          image: ${{ steps.build_image.outputs.image }}
+          tags: ${{ steps.build_image.outputs.tags }}
+          registry: ${{ vars.IMAGE_REGISTRY }}/${{ vars.IMAGE_NAMESPACE }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}