Mark project as safe for git ops

Author: dases

Dockerfile

@@ -10,3 +10,6 @@ RUN apt-get update && apt-get install -y \
     wget \
     && rm -rf /var/lib/apt/lists/*
 COPY . /project
+# Git ≥2.35.2 blocks repo access across users. The checkout step runs as
+# the Actions runner user, but this step runs as root inside docker:dind.
+git config --global --add safe.directory /project