add variable for the restart policy

docker-compose.yml

@@ -6,7 +6,7 @@ services:
   postgres:
     container_name: postgres_mattermost
     image: postgres:${POSTGRES_IMAGE_TAG}
-    restart: unless-stopped
+    restart: ${RESTART_POLICY}
     volumes:
       - ${POSTGRES_DATA_PATH}:/var/lib/postgresql/data
     environment:
@@ -21,7 +21,7 @@ services:
   nginx:
     container_name: nginx_mattermost
     image: nginx:${NGINX_IMAGE_TAG}
-    restart: unless-stopped
+    restart: ${RESTART_POLICY}
     volumes:
       - ${NGINX_MATTERMOST_CONFIG}:/etc/nginx/conf.d/mattermost.conf:ro
       - ${NGINX_DHPARAMS_FILE}:/dhparams4096.pem
@@ -40,7 +40,7 @@ services:
       - nginx
     container_name: mattermost
     image: mattermost/${MATTERMOST_IMAGE}:${MATTERMOST_IMAGE_TAG}
-    restart: unless-stopped
+    restart: ${RESTART_POLICY}
     volumes:
       - ${MATTERMOST_CONFIG_PATH}:/mattermost/config:rw
       - ${MATTERMOST_DATA_PATH}:/mattermost/data:rw

env.example

@@ -3,6 +3,7 @@
 ## A list of these tz database names can be looked up at Wikipedia
 ## https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
 TZ=UTC
+RESTART_POLICY=unless-stopped
 
 # Postrges settings
 ## Documentation for this image and available settings can be found on hub.docker.com