Automatically cleanup prerelease branches after full release

.github/workflows/docs.yml

@@ -2,8 +2,6 @@ name: Docs
 
 on:
   push:
-    branches:
-      - master
     tags:
       - "*"
 
@@ -31,8 +29,7 @@ jobs:
         echo "BRANCH_NAME=docs/v${{ steps.semver.outputs.major }}.${{ steps.semver.outputs.minor }}" >> $GITHUB_ENV
     - name: Set branch name for Prerelease
       if: ${{ steps.semver.outputs.prerelease != '' }}
-      # Cover all prereleases in one single rc branch. Administrators should manually delete the docs/vX.Y-rc branches from time to time for cleanup rc releases.
-      run: echo "BRANCH_NAME=docs/v${{ env.MINOR_VERSION}}-rc" >> $GITHUB_ENV
+      run: echo "BRANCH_NAME=${{ env.BRANCH_NAME }}-rc" >> $GITHUB_ENV
 
     - name: Checkout remote branch if exists
       run: git checkout ${{ env.BRANCH_NAME }}
@@ -52,7 +49,12 @@ jobs:
       if: ${{ steps.semver.outputs.prerelease != '' }}
 
     - name: Commit
-      run: git commit -all --message "Update version for Antora" --author "Antora via GitHub Actions <actions@github.com>"
+      run: git commit -all --message "Update version for Antora"
       continue-on-error: true
     - name: Push
       run: git push --atomic --force --set-upstream origin ${{ env.BRANCH_NAME }}
+
+    - name: Cleanup prerelease branch if existing
+      if: ${{ steps.semver.outputs.prerelease == '' }}
+      run: git push origin --delete ${{ env.BRANCH_NAME }}-rc
+      continue-on-error: true