Fix: disable git's safe.directory handling completely

Starting with GIT 2.35.3, GIT disallows operating on directories owned by other users.

This is to prevent hooks from taking over the system, but this container is a single-user
environment, and hooks are generally not configured on checkout anyway.

This container has a different $UID/$GID than the parent worker, which performs `git clone`.

With this `git config` change, we ignore this security scenario completely.

Ref: https://stackoverflow.com/questions/71849415/i-cannot-add-the-parent-directory-to-safe-directory-in-git/71904131#71904131

Author: Ocramius

Dockerfile

@@ -206,6 +206,7 @@ RUN apt update \
     && apt autoremove -y \
     && apt clean
 
+RUN git config --global --add safe.directory '*'
 
 # Build/install static modules that do not have packages
 COPY mods-available /mods-available