feat(base): build for alternative architectures (#620)

Author: mfocko

.github/workflows/base-image-rebuild.yml

@@ -41,6 +41,7 @@ jobs:
         with:
           image: ${{ steps.build-image.outputs.image }}
           tags: ${{ steps.build-image.outputs.tags }}
+          archs: amd64, arm64, ppc64le
           registry: quay.io/packit
           username: ${{ secrets.QUAY_IMAGE_BUILDER_USERNAME }}
           password: ${{ secrets.QUAY_IMAGE_BUILDER_TOKEN }}