[ci][publisher] Fix docker image push

Author: benjaminguttmann-avtq

ci/pipelines/publisher.yml

@@ -480,12 +480,29 @@ jobs:
         path: /bin/bash
         args:
           - -ce
-          - tar xvf ../candidate-(@= data.values.stemcell_details.os_name @)-stemcell-(@= str(data.values.stemcell_details.major_version) @)/bosh-stemcell-*-warden-boshlite-(@= data.values.stemcell_details.os_name @)*.tgz image
+          - |
+            tar xvf ../candidate-(@= data.values.stemcell_details.os_name @)-stemcell-(@= str(data.values.stemcell_details.major_version) @)/bosh-stemcell-*-warden-boshlite-(@= data.values.stemcell_details.os_name @)*.tgz image
+            printf 'FROM scratch\nADD image /\n' > Dockerfile
+  - task: build-stemcell-oci-image
+    privileged: true
+    config:
+      platform: linux
+      image_resource:
+        type: registry-image
+        source:
+          repository: concourse/oci-build-task
+      inputs:
+        - name: stemcell-image
+      outputs:
+        - name: image
+      params:
+        CONTEXT: stemcell-image
+      run:
+        path: build
   - put: github-container-registry-(@= data.values.stemcell_details.os_name @)-stemcell
     params:
-      import_file: stemcell-image/image
-      tag_file: candidate-(@= data.values.stemcell_details.os_name @)-stemcell-(@= str(data.values.stemcell_details.major_version) @)/.resource/version
-      tag_as_latest: true
+      image: image/image.tar
+      additional_tags: candidate-(@= data.values.stemcell_details.os_name @)-stemcell-(@= str(data.values.stemcell_details.major_version) @)/.resource/version
   - put: published-(@= data.values.stemcell_details.os_name @)-stemcell-(@= str(data.values.stemcell_details.major_version) @)
     params:
       files:
@@ -838,11 +855,12 @@ resources:
   #@ end
 
 - name: github-container-registry-(@= data.values.stemcell_details.os_name @)-stemcell
-  type: docker-image
+  type: registry-image
   source:
     repository: ghcr.io/cloudfoundry/(@= data.values.stemcell_details.os_name @)-stemcell
     username: ((github_read_write_packages.username))
     password: ((github_read_write_packages.password))
+    tag: latest
 
 - name: bosh-integration-registry-image
   type: registry-image