Force actions/checkout to use pull request HEAD sha (experiment)

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ on:
     branches:
       - main
     tags:
-      - 'v*'
+      - "v*"
   workflow_dispatch:
   pull_request:
 
@@ -26,7 +26,7 @@ jobs:
     services:
       db:
         image: postgres:15
-        ports: ['5432:5432']
+        ports: ["5432:5432"]
         env:
           POSTGRES_PASSWORD: postgres
         options: >-
@@ -110,6 +110,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Log in to the Container registry
         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
@@ -132,7 +134,7 @@ jobs:
             type=raw,enable={{is_default_branch}},value=latest
             # tag event (eg. "v1.2.3")
             type=ref,event=tag
-      
+
       - name: Check if PR publish
         if: ${{ github.event_name == 'pull_request' }}
         id: pr_publish_check