CLDC-4263: add descriptive comment

.github/workflows/review_pipeline.yml

@@ -17,6 +17,32 @@ defaults:
     shell: bash
 
 jobs:
+  hint:
+    name: Add review app hint
+    if: github.event.action == 'opened' && !contains(github.event.pull_request.labels.*.name, 'deploy-review')
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Comment on PR
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const msg = 'To deploy a review app for this PR, add the `deploy-review` label.';
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            });
+            if (!comments.find(c => c.body.startsWith('To deploy a review app'))) {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body: msg,
+              });
+            }
+
   infra:
     name: Deploy review app infrastructure
     if: contains(github.event.pull_request.labels.*.name, 'deploy-review')
@@ -51,10 +77,21 @@ jobs:
 
     steps:
       - name: Comment on PR with URL
-        uses: unsplash/comment-on-pr@v1.3.0
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        uses: actions/github-script@v7
         with:
-          msg: "Created review app at https://review.submit-social-housing-data.communities.gov.uk/${{ github.event.pull_request.number }}. Note that the review app will be automatically deprovisioned after 30 days and will need the review app pipeline running again."
-          check_for_duplicate_msg: true
-          duplicate_msg_pattern: Created review app at*
+          script: |
+            const prNumber = context.issue.number;
+            const msg = `Created review app at https://review.submit-social-housing-data.communities.gov.uk/${prNumber}. Note that the review app will be automatically deprovisioned after 30 days and will need the review app pipeline running again.`;
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber,
+            });
+            if (!comments.find(c => c.body.startsWith('Created review app at'))) {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: prNumber,
+                body: msg,
+              });
+            }