Corrects Fedora image push action params

Author: jkachmar

.github/workflows/ghcup.yaml

@@ -19,22 +19,37 @@ jobs:
       - name: "Build `ghcup` image."
         id: "build-ghcup-image"
         run: |
-          image=$(
+          image_id=$(
             ./ghcup/builder.sh \
               -a "${{ env.alpine_ver }}" \
+              -n "ghcup" \
             | tail -n 1
           )
-          echo "::set-output name=image::${image}"
+          echo "::set-output name=image_id::${image_id}"
+
+          image_name=$(
+            buildah images --format "{{.Name}}" ${image_id}
+          )
+
+          # NOTE: This parameter expansion drops the leading `localhost/` that
+          # `buildah` (and other OCI tools) prepend to local image names.
+          echo "::set-output name=image_name::${image_name#*/}"
+
+          image_tags=$(
+            buildah images --format "{{.Tag}}" ${image_id}
+          )
+          echo "::set-output name=image_tags::${image_tags}"
 
       - name: "Push `ghcup` image to the GitHub Container Registry"
         id: "push-ghcup-to-ghcr"
         uses: "redhat-actions/push-to-registry@v2"
         with:
-          image: "${{ steps.build-ghcup-image.outputs.image }}"
+          image: "${{ steps.build-ghcup-image.outputs.image_name }}"
+          tags: "${{ steps.build-ghcup-image.outputs.image_tags }}"
+          registry: "ghcr.io/${{ github.repository_owner }}"
           username: "${{ github.actor }}"
           password: "${{ github.token }}"
-          registry: "ghcr.io/${{ github.repository_owner }}"
 
       - name: "Print image URL."
         run: |
-          echo "Image pushed to [ ${{ steps.push-ghcup-to-ghcr.outputs.registry-paths }} ]"
+          echo "Image pushed to ${{ steps.push-ghcup-to-ghcr.outputs.registry-paths }}"