CLDC-4263: implement minimal label-based approach

.github/workflows/review_pipeline.yml

@@ -9,6 +9,7 @@ on:
       - opened
       - synchronize
       - reopened
+      - labeled
   workflow_dispatch:
 
 defaults:
@@ -18,6 +19,7 @@ defaults:
 jobs:
   infra:
     name: Deploy review app infrastructure
+    if: contains(github.event.pull_request.labels.*.name, 'deploy-review')
     uses: communitiesuk/submit-social-housing-lettings-and-sales-data-infrastructure/.github/workflows/create_review_app_infra.yml@main
     with:
       key: ${{ github.event.pull_request.number }}
@@ -40,6 +42,7 @@ jobs:
 
   comment:
     name: Add link to PR
+    if: contains(github.event.pull_request.labels.*.name, 'deploy-review')
     needs: [code]
     runs-on: ubuntu-latest
     permissions: