refactorin docker files

docs/assets/docker/Dockerfile

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+FROM node:latest
+WORKDIR /
+RUN yarn global add gancio

docs/assets/docker/postgres/docker-compose.yml

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+version: '3'
+
+services:
+  db:
+    image: postgres
+    container_name: postgres
+    volumes:
+      - db:/var/lib/postgres
+      - /etc/localtime:/etc/localtime:ro
+    environment:
+      - POSTGRES_USER=gancio
+      - POSTGRES_DB=gancio
+      - POSTGRES_PASSWORD=gancio
+    restart: always
+    ports:
+        - 5432:5432
+  gancio:
+    build: .
+    image: node:latest
+    container_name: gancio
+    restart: always
+    command: gancio start --docker --db=postgresql
+    volumes:
+      - ./config.json:/opt/gancio/config.json
+      - ./uploads:/opt/gancio/uploads
+    depends_on:
+        - db
+    ports:
+      - "localhost:13120:13120"

docs/assets/docker/sqlite/docker-compose.yml

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+version: '3'
+
+services:
+  gancio:
+    build: .
+    restart: always
+    image: node:latest
+    container_name: gancio
+    command: gancio start --docker --db=sqlite
+    environment:
+      - DEBUG
+    volumes:
+      - ./db.sqlite:/opt/gancio/db.sqlite
+      - ./config.json:/opt/gancio/config.json
+      - ./uploads:/opt/gancio/uploads
+    ports:
+      - "127.0.0.1:13120:13120"