Adding variable for BACKEND_URL

backend/docker-compose.yml

@@ -22,6 +22,7 @@ services:
       - "db"
       - "redis"
     environment:
+      backend_url: "${BACKEND_URL}"
       messenger_default_api: "${messenger_default_api}"
       smtp_server: "${smtp_server}"
       smtp_sender: "${smtp_sender}"
@@ -45,6 +46,7 @@ services:
       - "redis"
       - "backend"
     environment:
+      backend_url: "${BACKEND_URL}"
       messenger_default_api: "${messenger_default_api}"
       smtp_server: "${smtp_server}"
       smtp_sender: "${smtp_sender}"
@@ -64,6 +66,7 @@ services:
       - "redis"
       - "backend"
     environment:
+      backend_url: "${BACKEND_URL}"
       messenger_default_api: "${messenger_default_api}"
       smtp_server: "${smtp_server}"
       smtp_sender: "${smtp_sender}"
@@ -84,6 +87,7 @@ services:
       - "redis"
       - "backend"
     environment:
+      backend_url: "${BACKEND_URL}"
       messenger_default_api: "${messenger_default_api}"
       smtp_server: "${smtp_server}"
       smtp_sender: "${smtp_sender}"