Apply suggestions from code review

Co-authored-by: gabalafou <gabriel@fouasnon.com>

Author: soapy1

.github/workflows/release.yml

@@ -150,6 +150,7 @@ jobs:
 
   build_and_push_docker_image:
     name: "Build Docker Images 🛠"
+    if: github.repository_owner == 'conda-incubator' && github.event_name == 'release' && startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-latest
     needs: release-to-npmjs
     permissions:
@@ -198,6 +199,6 @@ jobs:
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v2
         with:
-          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          subject-name: ${{ env.GH_CONTAINER_REGISTRY }}/${{ env.IMAGE_NAME }}
           subject-digest: ${{ steps.push.outputs.digest }}
           push-to-registry: true