ci: restore persist credentials when no output is generated (#10211)

.github/workflows/api-container-checks.yml

@@ -30,7 +30,8 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
-          persist-credentials: false
+          # zizmor: ignore[artipacked]
+          persist-credentials: true # Required by tj-actions/changed-files to fetch PR branch
 
       - name: Check if Dockerfile changed
         id: dockerfile-changed
@@ -67,7 +68,8 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
-          persist-credentials: false
+          # zizmor: ignore[artipacked]
+          persist-credentials: true # Required by tj-actions/changed-files to fetch PR branch
 
       - name: Check for API changes
         id: check-changes