docker image -> stable

.github/workflows/push-master.yml

@@ -34,7 +34,7 @@ jobs:
   # only run on "CI skip", i.e. when the actual version has been bumped to release/stable
   docker:
     name: docker
-    if: "startsWith(github.event.head_commit.message, '[CI Skip] release/') && github.repository == 'polkadot-js/apps'"
+    if: "startsWith(github.event.head_commit.message, '[CI Skip] release/stable') && github.repository == 'polkadot-js/apps'"
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1