make cron work in example

example/.env

@@ -0,0 +1,13 @@
+
+
+APP_DEBUG=1
+APP_URL=http://localhost:8000
+DB_USERNAME=root
+DB_PASSWORD=pwd
+DB_HOST=mysql
+MAIL_HOST=mail.service.host
+MAIL_USERNAME=username
+MAIL_PASSWORD=password
+MAIL_DRIVER=smtp
+MAIL_FROM_NAME="My name"
+MAIL_FROM_ADDRESS=user@mail.com

example/docker-compose.yml

@@ -11,10 +11,7 @@ services:
     image: invoiceninja/invoiceninja
     links:
       - db:mysql
-    environment:
-      APP_DEBUG: 1
-      DB_USERNAME: root
-      DB_PASSWORD: pwd
+    env_file: .env
 
   web:
     image: nginx
@@ -25,15 +22,15 @@ services:
     volumes_from:
       - app
     ports:
-      - 80
+      - 8000:80
 
   cron:
     image: invoiceninja/invoiceninja
     links:
       - db:mysql
-    user: www-data
-    environment:
-      APP_DEBUG: 1
+    env_file: .env
+    volumes_from:
+      - app
     entrypoint: |
       bash -c 'bash -s <<EOF
       trap "break;exit" SIGHUP SIGINT SIGTERM