Add workflow to remind PR reviewers to also review the testing instructions. (#36918)

* Add workflow to remind PR reviewers to also review the testing instructions.

* Update review-testing-instructions GitHub Actions workflow to also mentioning teams in the comment.

* Update review-testing-instructions GitHub Actions workflow to find if the comment it posts was already posted and - in that case - update it instead of creating a new one.

* Pin find-comment and create-or-update-comment thirdparty GitHub Actions to full length commit SHA instead of tag for better security.

.github/workflows/cot-build-and-e2e-tests-daily.yml

@@ -173,7 +173,7 @@ jobs:
                       return await script( { core } )
 
             - name: Find PR comment by github-actions[bot]
-              uses: peter-evans/find-comment@v2
+              uses: peter-evans/find-comment@034abe94d3191f9c89d870519735beae326f2bdb
               id: find-comment
               with:
                   issue-number: ${{ github.event.pull_request.number }}
@@ -181,7 +181,7 @@ jobs:
                   body-includes: Test Results Summary
 
             - name: Create or update PR comment
-              uses: peter-evans/create-or-update-comment@v2
+              uses: peter-evans/create-or-update-comment@67dcc547d311b736a8e6c5c236542148a47adc3d
               with:
                   comment-id: ${{ steps.find-comment.outputs.comment-id }}
                   issue-number: ${{ github.event.pull_request.number }}

.github/workflows/pr-build-and-e2e-tests.yml

@@ -219,7 +219,7 @@ jobs:
                       return await script( { core } )
 
             - name: Find PR comment by github-actions[bot]
-              uses: peter-evans/find-comment@v2
+              uses: peter-evans/find-comment@034abe94d3191f9c89d870519735beae326f2bdb
               id: find-comment
               with:
                   issue-number: ${{ github.event.pull_request.number }}
@@ -227,7 +227,7 @@ jobs:
                   body-includes: Test Results Summary
 
             - name: Create or update PR comment
-              uses: peter-evans/create-or-update-comment@v2
+              uses: peter-evans/create-or-update-comment@67dcc547d311b736a8e6c5c236542148a47adc3d
               with:
                   comment-id: ${{ steps.find-comment.outputs.comment-id }}
                   issue-number: ${{ github.event.pull_request.number }}

.github/workflows/review-testing-instructions.yml

@@ -0,0 +1,48 @@
+name: Remind reviewers to also review the testing instructions.
+on:
+  pull_request:
+    types: [review_requested]
+
+permissions: {}
+
+jobs:
+  add-testing-instructions-review-comment:
+    runs-on: ubuntu-20.04
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Get the username of requested reviewers
+        id: get_reviewer_username
+        run: |
+          # Retrieves the username of all reviewers and stores them in a comma-separated list
+          reviewers=$(echo '${{ toJson(github.event.pull_request.requested_reviewers[*].login) }}' | jq -r 'map("@\(.)") | join(", ")')
+          echo "REVIEWERS=$reviewers" >> $GITHUB_ENV
+
+      - name: Get the name of requested teams
+        id: get_team_name
+        run: |
+          # Retrieves the name of all teams asked for review and stores them in a comma-separated list
+          teams=$(echo '${{ toJson(github.event.pull_request.requested_teams[*].slug) }}' | jq -r 'map("@woocommerce/\(.)") | join(", ")')
+          echo "TEAMS=$teams" >> $GITHUB_ENV
+
+      - name: Find the comment by github-actions[bot] asking for reviewing the testing instructions
+        uses: peter-evans/find-comment@034abe94d3191f9c89d870519735beae326f2bdb
+        id: find-comment
+        with:
+            issue-number: ${{ github.event.pull_request.number }}
+            comment-author: 'github-actions[bot]'
+            body-includes: please make sure to review the testing instructions
+
+      - name: Create or update PR comment asking for reviewers to review the testing instructions
+        uses: peter-evans/create-or-update-comment@67dcc547d311b736a8e6c5c236542148a47adc3d
+        with:
+            comment-id: ${{ steps.find-comment.outputs.comment-id }}
+            issue-number: ${{ github.event.pull_request.number }}
+            body: |
+              Hi ${{ env.REVIEWERS }}, ${{ env.TEAMS }}
+              
+              Apart from reviewing the code changes, please make sure to review the testing instructions as well.
+              
+              You can follow this guide to find out what good testing instructions should look like:
+              https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions
+            edit-mode: replace