improve update workflow

.github/workflows/update.yml

@@ -3,13 +3,20 @@ name: "update_dockerfiles"
 on:
   schedule:
       - cron: '57 19 * * *'
+  workflow_dispatch:  # Allow manual triggering
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
 jobs:
   update_dockerfiles:
     name: "update_dockerfiles"
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Fetch all history for all branches and tags
+
       - run: docker ps -a
       - name: Login to dockerhub
         uses: docker/login-action@v3
@@ -40,22 +47,60 @@ jobs:
             echo "versions.json not changed"
           fi
 
+      - name: Check for existing open PRs with label 'automated_pr'
+        if: env.versions_changed == 'true'
+        id: check_prs
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          existing_prs=$(gh pr list --label automated_pr --json number --jq length)
+          if [ "$existing_prs" -eq "0" ]; then
+            echo "create_pr=true" >> $GITHUB_OUTPUT
+          else
+            echo "create_pr=false" >> $GITHUB_OUTPUT
+            echo "An automated PR already exists. Skipping PR creation."
+          fi
+
       # https://github.com/peter-evans/create-pull-request
       - name: Create Pull Request
-        if: env.versions_changed == 'true'
+        if: env.versions_changed == 'true' && steps.check_prs.outputs.create_pr == 'true'
+        id: create-pr        
         uses: peter-evans/create-pull-request@v6
         with:
-#          token: ${{ secrets.POSTGIS_PR_REPO_TOKEN }}
           committer: GitHub <noreply@github.com>
           author: ${{ github.actor }} <${{ github.actor }}@users.noreply.github.com>
-          commit-message: Update versions.json and related Dockerfiles
-          title: '🤖 Bump the: ${{ env.versions_changed_list }}'
+          commit-message: '🤖 Bump versions: ${{ env.versions_changed_list }}'
+          title: '🤖 Bump versions: ${{ env.versions_changed_list }}'
           body: |
-            Update docker-postgis versions.json and related Dockerfiles.
-            Changes: ${{ env.versions_changed_list }}
+            ## Automated Version Update
+
+            This pull request was automatically generated by the `update_dockerfiles`  workflow ( `.github/workflows/update.yml`)
+            to update docker-postgis versions.json and related Dockerfiles.
+
+            ### Changes
+             ${{ env.versions_changed_list }}
+
+            ### Important Notes
+            1. **Verification Required**: Please carefully review the changes to ensure they are correct and appropriate.
+            2. **PR Limit**: While this PR remains open, no new automated PRs will be created by this workflow. This ensures only one automated update is processed at a time.
+
+            If you have any questions or concerns, please comment on this PR or contact the maintainers.
 
-            Auto-generated by .github/workflows/update.yml
-            Please verify if the changes are correct!
           labels: automated_pr
           branch: ${{ env.BRANCH_NAME }}
           delete-branch: true
+
+      - name: Close and Reopen PR
+        if: steps.create-pr.outputs.pull-request-number
+        run: |
+            PR_NUMBER=${{ steps.create-pr.outputs.pull-request-number }}
+            gh pr close $PR_NUMBER --comment "Closing to trigger full CI/CD pipeline"
+            sleep 5  # Wait for 5 seconds to ensure the PR is fully closed
+            gh pr reopen $PR_NUMBER --comment "Reopening to trigger full CI/CD pipeline"
+  
+      - name: Comment PR
+        if: steps.create-pr.outputs.pull-request-number
+        run: |
+            PR_NUMBER=${{ steps.create-pr.outputs.pull-request-number }}
+            gh pr comment $PR_NUMBER --body "This PR was automatically created and reopened by the update_dockerfiles workflow to trigger the full CI/CD pipeline. Please review the changes carefully."
+