added logic to dismiss reviews

copied from paritytech/polkadot-sdk#4152 and paritytech/polkadot-sdk#3431

.github/workflows/review-trigger.yml

@@ -13,9 +13,50 @@ on:
 
 jobs:
   trigger-review-bot:
+    # (It is not a draft) && (it is not a review || it is an approving review)
+    if: ${{ github.event.pull_request.draft != true && (github.event_name != 'pull_request_review' || (github.event.review && github.event.review.state == 'APPROVED')) }}
     runs-on: ubuntu-latest
     name: trigger review bot
     steps:
+      - name: Get PR data
+        id: comments
+        run: |
+          echo "bodies=$(gh pr view ${{ github.event.pull_request.number }} --repo ${{ github.repository }} --json comments --jq '[.comments[].body]')" >> "$GITHUB_OUTPUT"
+          echo "reviews=$(gh api repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/reviews --jq '[.[].state]')" >> "$GITHUB_OUTPUT"
+        env:
+          GH_TOKEN: ${{ github.token }}
+      - name: Get the GitHub handle of the fellows
+        uses: paritytech/[email protected]
+        id: fellows
+        # Require new reviews when the author is pushing and he is not a fellow
+      - name: Fail when author pushes new code
+        # if (contains approved reviews && it's a synchronize event && was triggered by the author (who is not a fellow))
+        if: |
+          contains(fromJson(steps.comments.outputs.reviews), 'APPROVED') &&
+          github.event_name == 'pull_request_target' &&
+          github.event.action == 'synchronize' && 
+          github.event.sender.login == github.event.pull_request.user.login && 
+          contains(steps.fellows.outputs.github-handles, github.event.pull_request.user.login)
+        run: |
+          # We get the list of reviewers who approved the PR
+          REVIEWERS=$(gh api repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/reviews \
+          --jq '{reviewers: [.[] | select(.state == "APPROVED") | .user.login]}')
+
+          # We request them to review again
+          echo $REVIEWERS | gh api --method POST repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/requested_reviewers --input -
+          
+          echo "::error::Project needs to be reviewed again"
+          exit 1
+        env:
+          GH_TOKEN: ${{ github.token }}
+      - name: Comment requirements
+        # If the previous step failed and github-actions hasn't commented yet we comment instructions
+        if: failure() && !contains(fromJson(steps.comments.outputs.bodies), 'Review required! Latest push from author must always be reviewed')
+        run: |          
+          gh pr comment ${{ github.event.pull_request.number }} --repo ${{ github.repository }} --body "Review required! Latest push from author must always be reviewed"
+        env:
+          GH_TOKEN: ${{ github.token }}
+          COMMENTS: ${{ steps.comments.outputs.users }}
       - name: Get PR number
         env:
           PR_NUMBER: ${{ github.event.pull_request.number }}