Refactor Dockerfile to improve user configuration and permissions

- Removed the creation of a home directory for the nginx user, simplifying the setup for a stateless image.
- Updated git configuration to use a temporary home directory, enhancing compatibility with non-root user practices.
- Adjusted ownership of the temporary git configuration file to align with UID and GID parameters.

server/Dockerfile

@@ -24,13 +24,13 @@ RUN find . -mindepth 1 -delete \
 COPY nginx/default.conf /etc/nginx/conf.d/default.conf
 COPY refresh.sh /refresh.sh
 
+# Pas de « su 101 » : git config en root puis chown. HOME=/tmp : pas de /home artificiel dans une image stateless.
 RUN chmod +x /refresh.sh \
   && chown -R "${UID}:${GID}" /usr/share/nginx/html /refresh.sh \
-  && mkdir -p /home/nginx \
-  && chown "${UID}:${GID}" /home/nginx \
-  && su "${UID}" -s /bin/sh -c 'HOME=/home/nginx git config --global --add safe.directory /usr/share/nginx/html'
+  && HOME=/tmp git config --global --add safe.directory /usr/share/nginx/html \
+  && chown "${UID}:${GID}" /tmp/.gitconfig
 
-ENV HOME=/home/nginx
+ENV HOME=/tmp
 
 USER ${UID}