ci: mark the layer checkout safe for git in yocto-check-layer

The checkout is owned by the runner user while the container runs as ci, so
git refuses to read /work. Mark it as a safe directory, as the DCO check
already does.

Signed-off-by: Andrei Gherzan <andrei@gherzan.com>

.github/workflows/docker-images/yocto-builder/entrypoint-yocto-check-layer.sh

@@ -16,6 +16,13 @@ GIT_REPO_PATH="/work"
 [ -d "$GIT_REPO_PATH/.git" ] ||
     error "Can't find a git checkout under $GIT_REPO_PATH ."
 
+# The GitHub runner user and the container user might differ making git error
+# out with:
+# 	error: fatal: detected dubious ownership in repository at '/work'
+# Avoid this as the security risk is minimum here while guarding the git hooks
+# via PRs.
+git config --global --add safe.directory /work
+
 TEMP_DIR="$(mktemp -d)"
 cd "$TEMP_DIR"