[CI] avoid safe.directory issues when cloning

.woodpecker/.phpunit.yml

@@ -26,7 +26,19 @@ when:
     exclude: [ stable ]
   event: [ pull_request, push ]
 
+skip_clone: true
+
 steps:
+  clone:
+    image: alpine/git
+    commands:
+      - git config --global user.email "no-reply@friendi.ca"
+      - git config --global user.name "Friendica"
+      - git config --global --add safe.directory $CI_WORKSPACE
+      - git clone $CI_REPO_CLONE_URL .
+      - git checkout $CI_COMMIT_BRANCH
+      - git fetch origin $CI_COMMIT_REF
+      - git merge $CI_COMMIT_SHA
   php-lint:
     image: php:${PHP_MAJOR_VERSION}
     commands: