CLDC-4351: only teardown review apps for prs with review apps (#3293)

* CLDC-4351: tear down review apps on label removal OR on pr close for labelled prs

* CLDC-4351: add teardown success comment on unlabel

* CLDC-4351: update deploy comment with teardown process

* CLDC-4351: typo fix

* CLDC-4351: typo fix

* CLDC-4351: typo fix

.github/workflows/review_deploy.yml

@@ -55,7 +55,7 @@ jobs:
         with:
           script: |
             const prNumber = context.issue.number;
-            const msg = `Created review app at https://review.submit-social-housing-data.communities.gov.uk/${prNumber}. Note that the review app will be automatically deprovisioned after 30 days and will need the review app pipeline running again.`;
+            const msg = `Created review app at https://review.submit-social-housing-data.communities.gov.uk/${prNumber}. Note that the review app will be automatically deprovisioned after 30 days and will need the review app pipeline running again. To tear down the review app entirely, remove the \`review-app\` label or merge/close the PR.`;
             const { data: comments } = await github.rest.issues.listComments({
               owner: context.repo.owner,
               repo: context.repo.repo,

.github/workflows/review_teardown_pipeline.yml

@@ -7,6 +7,7 @@ on:
   pull_request:
     types:
       - closed
+      - unlabeled
 
 env:
   app_repo_role: arn:aws:iam::815624722760:role/core-application-repo
@@ -18,6 +19,9 @@ env:
 jobs:
   database:
     name: Drop database
+    if: >
+      (github.event.action == 'closed' && contains(github.event.pull_request.labels.*.name, 'review-app'))
+      || (github.event.action == 'unlabeled' && github.event.label.name == 'review-app')
     runs-on: ubuntu-latest
     permissions:
       id-token: write
@@ -54,6 +58,9 @@ jobs:
 
   infra:
     name: Teardown review app
+    if: >
+      (github.event.action == 'closed' && contains(github.event.pull_request.labels.*.name, 'review-app'))
+      || (github.event.action == 'unlabeled' && github.event.label.name == 'review-app')
     needs: [database]
     uses: communitiesuk/submit-social-housing-lettings-and-sales-data-infrastructure/.github/workflows/destroy_review_app_infra.yml@main
     with:
@@ -61,3 +68,23 @@ jobs:
       app_repo_role: arn:aws:iam::815624722760:role/core-application-repo
     permissions:
       id-token: write
+
+  comment:
+    name: Comment on PR
+    if: github.event.action == 'unlabeled' && github.event.label.name == 'review-app'
+    needs: [infra]
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+
+    steps:
+      - name: Comment on PR
+        uses: actions/github-script@v7
+        with:
+          script: |
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body: 'Review app has been torn down. To redeploy, reapply the `review-app` label.',
+            });