build single arch for PR

Author: andrewazores

.github/workflows/ci.yml

@@ -64,7 +64,7 @@ jobs:
       uses: redhat-actions/buildah-build@v2
       with:
         image: ${{ env.CI_IMG }}
-        archs: amd64, arm64
+        archs: ${{ github.event_name == 'pull_request' && 'amd64' || 'amd64, arm64' }}
         tags: ${{ github.event_name != 'pull_request' && github.ref_name || '' }} ${{ github.ref == 'refs/heads/main' && 'latest' || '' }} ${{ env.DATE_TAG }} ${{ steps.check-branch.outputs.image-tag }} ${{ steps.check-commit.outputs.image-tag }} ${{ steps.check-commit.outputs.image-tag-patch }} ${{ steps.check-commit.outputs.image-tag-release }}
         containerfiles: |
           ./Containerfile