change(docker): merge production git repo bind mount

This merge requires production users to specify an host
directory to bind as the git repository within Docker containers.

This means that a repository can be shared between host
and container, so that the repository does not need to be
managed within Docker alone.

New environment variables:

- GIT_DATA_DIR: Path to aur.git repository that is bind mounted

Do note, this variable only takes affect when users run
production Docker services, by supplying:

    $ docker-compose -f docker-compose.yml -f docker-compose.prod.yml ...

.env

@@ -3,3 +3,4 @@ FASTAPI_WORKERS=2
 MARIADB_SOCKET_DIR="/var/run/mysqld/"
 CGIT_CLONE_PREFIX_PHP=https://localhost:8443
 CGIT_CLONE_PREFIX_FASTAPI=https://localhost:8444
+GIT_DATA_DIR="./aur.git/"

docker-compose.prod.yml

@@ -7,16 +7,24 @@ services:
 
   git:
     volumes:
-      - git_data:/aurweb/aur.git
+      - ${GIT_DATA_DIR}:/aurweb/aur.git
       - cache:/cache
       - ${MARIADB_SOCKET_DIR}:/var/run/mysqld
 
   smartgit:
     volumes:
-      - git_data:/aurweb/aur.git
+      - ${GIT_DATA_DIR}:/aurweb/aur.git
       - cache:/cache
       - smartgit_run:/var/run/smartgit
 
+  cgit-php:
+    volumes:
+      - ${GIT_DATA_DIR}:/aurweb/aur.git
+
+  cgit-fastapi:
+    volumes:
+      - ${GIT_DATA_DIR}:/aurweb/aur.git
+
   php-fpm:
     volumes:
       - cache:/cache
@@ -35,7 +43,7 @@ services:
 
   nginx:
     volumes:
-      - git_data:/aurweb/aur.git
+      - ${GIT_DATA_DIR}:/aurweb/aur.git
       - cache:/cache
       - logs:/var/log/nginx
       - smartgit_run:/var/run/smartgit