refactor(workflow): remove unused keepalive job

* Deleted the `workflow-keepalive` job from the Docker publish workflow.

Author: dgibbs64

.github/workflows/action-docker-publish.yml

@@ -168,11 +168,3 @@ jobs:
           package-type: container
           min-versions-to-keep: 1
           delete-only-untagged-versions: true
-
-  workflow-keepalive:
-    if: github.event_name == 'schedule'
-    runs-on: ubuntu-latest
-    permissions:
-      actions: write
-    steps:
-      - uses: liskin/gh-workflow-keepalive@v1