fix(pub-con): Check if tar or zip to allow apptainers

publish-container/action.yaml

@@ -62,19 +62,23 @@ runs:
         skopeo login \
           --username "${{ github.actor }}" \
           --password "${{ inputs.container-token }}" \
-          "${{ vars.REGISTRY }}"
+          "${{ inputs.REGISTRY }}"
 
         # Build container
         nix-build -A containers."${{ inputs.project }}" \
           --argstr env "${{ steps.envvars.outputs.ENV }}"
 
         # The Nix build creates a compressed tar.gz file, we need to extract it first
+        IMAGE_TAR="$(readlink -f result)"
         cd /tmp/skopeo
-        cp ${GITHUB_WORKSPACE}/result ./docker-image.tar.gz
-        gunzip docker-image.tar.gz
-
-        # ls -alh ./result
-        # skopeo inspect docker-archive://$(readlink -f ./result)
+        if file "${IMAGE_TAR}" | grep -qi gzip; then
+          echo "Detected gzip-compressed image"
+          cp "${IMAGE_TAR}" docker-image.tar.gz
+          gunzip docker-image.tar.gz
+        else
+          echo "Detected uncompressed image"
+          cp "${IMAGE_TAR}" docker-image.tar
+        fi
 
         echo "Pushing image: ${{ steps.envvars.outputs.IMAGE_NAME }}"
         skopeo copy \