Git Bridge: support git-bridge configuration via env in nginx

- generate overleaf.conf dynamically
- support GIT_BRIDGE_HOST and GIT_BRIDGE_PORT
- configure client_max_body_size for /git using GIT_BRIDGE_REPOSTORE_MAX_FILE_SIZE

server-ce/init_scripts/200_nginx_config_template.sh

@@ -16,12 +16,18 @@ fi
 nginx_template_file="${nginx_templates_dir}/nginx.conf.template"
 nginx_config_file="${nginx_dir}/nginx.conf"
 
+overleaf_template_file="${nginx_templates_dir}/overleaf.conf.template"
+overleaf_config_file="${nginx_dir}/sites-enabled/overleaf.conf"
+
 if [ -f "${nginx_template_file}" ]; then
   export NGINX_KEEPALIVE_TIMEOUT="${NGINX_KEEPALIVE_TIMEOUT:-65}"
   export NGINX_WORKER_CONNECTIONS="${NGINX_WORKER_CONNECTIONS:-768}"
   export NGINX_WORKER_PROCESSES="${NGINX_WORKER_PROCESSES:-4}"
   export MAX_UPLOAD_SIZE="${MAX_UPLOAD_SIZE:-50}"
 
+  export GIT_BRIDGE_HOST="${GIT_BRIDGE_HOST:-git-bridge}"
+  export GIT_BRIDGE_PORT="${GIT_BRIDGE_PORT:-8000}"
+  export GIT_BRIDGE_REPOSTORE_MAX_FILE_SIZE="${GIT_BRIDGE_REPOSTORE_MAX_FILE_SIZE:-52428800}"
   echo "Nginx: generating config file from template"
 
   # Note the single-quotes, they are important.
@@ -37,6 +43,15 @@ if [ -f "${nginx_template_file}" ]; then
     < "${nginx_template_file}" \
     > "${nginx_config_file}"
 
+  # Config git-bridge in nginx
+  envsubst '
+    ${GIT_BRIDGE_HOST}
+    ${GIT_BRIDGE_PORT}
+    ${GIT_BRIDGE_REPOSTORE_MAX_FILE_SIZE}
+  ' \
+    < "${overleaf_template_file}" \
+    > "${overleaf_config_file}"
+
   echo "Checking Nginx config"
   nginx -t