remove github release action (#7338)

substrate/.github/workflows/check-gitlab-pipeline.yml

@@ -1,30 +0,0 @@
-# A github action to track the status of the gitlab pipeline for tagged
-# releases, and cancel the release/create a new issue if it fails
-
-name: Monitor gitlab pipeline status
-
-on:
-  push:
-    tags:
-      - v*
-      - ci-release-*
-
-jobs:
-  monitor:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-      - name: Monitor pipeline
-        run: env; ./.maintain/github/check_gitlab_pipeline.sh
-        id: monitor_pipeline
-        env:
-          TAGGER: ${{ github.event.pusher.name }}
-      - name: Create Issue
-        if: failure()
-        uses: JasonEtco/create-an-issue@v2
-        with:
-          filename: .github/ISSUE_TEMPLATE/release.md
-          assignees: ${{ github.event.pusher.name }}
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}