Comment a summary of changes included in staging and prod deployment PRs

Author: carlobeltrame

.github/workflows/summarize-changes-on-staging-and-prod-prs.yml

@@ -0,0 +1,41 @@
+name: 'Summarize changes on staging and prod PRs'
+
+on:
+  pull_request_target:
+    types: [opened, reopened, labeled, synchronize]
+    branches: [staging, prod]
+
+jobs:
+  summarize-changes:
+    name: Summarize changes
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Compute summary text
+        id: summary
+        run: 'echo "summary=$(git log ${{ github.base_ref }}..${{ github.head_ref }} --merges --first-parent --perl-regexp --grep=''from ecamp/renovate/'' --invert-grep | grep ''Merge pull request'' | awk ''{print \"- \"$4}'' | tac)" >> $GITHUB_OUTPUT'
+
+      - name: Comment summary on PR
+        uses: thollander/actions-comment-pull-request@v3
+        with:
+          pr-number: ${{ github.event.pull_request.number }}
+          message: |
+            ### <span aria-hidden="true">🏗️</span> Changes in this deployment
+
+            Includes the following non-renovate PRs:
+            ${{ steps.summary.outputs.summary }}
+
+            <details>
+            <summary><small>Code to generate this overview</small></summary>
+
+            The above can be output locally using the following command:
+            ```bash
+            echo 'Includes the following non-renovate PRs:' && git log origin/${{ github.base_ref }}..origin/${{ github.head_ref }} --merges --first-parent --perl-regexp --grep='from ecamp/renovate/' --invert-grep | grep "Merge pull request" | awk '{print "- "$4}' | tac
+            ```
+
+            </details>
+
+          comment-tag: deployment-pr-summary