add dev docker compose file and pin mongo image to major version

Author: khakers

dev.docker-compose.yml

@@ -0,0 +1,21 @@
+services:
+  bot:
+    build:
+        context: .
+        dockerfile: Dockerfile
+    env_file:
+      - .env
+    environment:
+      - CONNECTION_URI=mongodb://mongo
+    depends_on:
+      - mongo
+  mongo:
+    image: mongo:7
+    restart: always
+    volumes:
+      - mongodb:/data/db
+    ports:
+      - 127.0.0.1:27017:27017
+
+volumes:
+  mongodb:

docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.7"
 services:
   bot:
     image: ghcr.io/raidensakura/modmail:stable
@@ -12,7 +11,7 @@ services:
       - mongo
   mongo:
     image: mongo
-    container_name: mongodb
+    container_name: mongodb:7
     restart: always
     volumes:
       - mongodb:/data/db