feat: cleanup docker setup

- Add .dockerignore
- Replace .env with .env.example
- Add migrations service
- Cleanup Dockerfile: simpler setup, simpler copy, no migrations inside the image
- Update README to match new instruction

docker-compose.yml

@@ -1,13 +1,32 @@
 version: "3.3"
 
 services:
-     nsecbunkerd:
-       image: nsecbunkerd
-       build: .
-       restart: unless-stopped
-       pids_limit: 50
-       mem_limit: 256mb
-       memswap_limit: 256mb
-       volumes:
-         - ./nsecbunker-config:/app/config
-       command: start --admin <npub>
+  nsecbunkerd:
+    image: pablof7z/nsecbunkerd
+    build: .
+    restart: unless-stopped
+    pids_limit: 100
+    mem_limit: 256mb
+    memswap_limit: 256mb
+    volumes:
+      - $HOME/.nsecbunker-config:/app/config
+    env_file:
+      - .env.example
+    ports:
+      - "3000:3000"
+    depends_on:
+      - migrations
+
+  migrations:
+    image: pablof7z/nsecbunkerd
+    volumes:
+      - $HOME/.nsecbunker-config:/app/config
+    env_file:
+      - .env.example
+    restart: no
+    entrypoint: ""
+    command:
+      - npx
+      - prisma
+      - migrate
+      - deploy