Make Send image configurable

.env.example

@@ -1,3 +1,6 @@
+# Docker image to use for Send
+DOCKER_SEND_IMAGE=mozilla/send:latest
+
 # Host to expose Send on
 HOST=send.example.org
 

README.md

@@ -19,6 +19,9 @@ See [docker-compose.yaml](./docker-compose.yaml).
 
 ### Example .env
 ```bash
+# Docker image to use for Send
+DOCKER_SEND_IMAGE=mozilla/send:latest
+
 # Host to expose Send on
 HOST=send.example.org
 

docker-compose.yaml

@@ -28,7 +28,7 @@ services:
       - proxy-vhost:/etc/nginx/vhost.d
       - proxy-html:/usr/share/nginx/html
   send:
-    image: 'mozilla/send:latest'
+    image: '${DOCKER_SEND_IMAGE}'
     restart: always
     ports:
       - '1234:1234'