feat: add docker files

adds compose.yml, Dockerfile and entrypoint.sh for running the backend inside of docker

compose.yml

@@ -0,0 +1,33 @@
+version: '3.5'
+volumes:
+  gorb-backend:
+  gorb-database:
+networks:
+  gorb:
+services:
+  backend:
+    image: gorb/backend:latest
+    restart: always
+    ports:
+      - 8080:8080
+    networks:
+      - gorb
+    volumes:
+      - gorb-backend:/gorb
+    environment:
+      - DATABASE_USERNAME=gorb
+      - DATABASE_PASSWORD=gorb
+      - DATABASE=gorb
+      - DATABASE_HOST=database
+      - DATABASE_PORT=5432
+  database:
+    image: postgres:16
+    restart: always
+    networks:
+      - gorb
+    volumes:
+      - gorb-database:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_USER=gorb
+      - POSTGRES_PASSWORD=gorb
+      - POSTGRES_DB=gorb