Adopt Compose v2 (#240)

* Adopt Compose v2

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

nginx-golang-postgres/compose.yaml

@@ -0,0 +1,31 @@
+services:
+  backend:
+    build: backend
+    secrets:
+      - db-password
+    depends_on:
+      - db
+  db:
+    image: postgres
+    restart: always
+    secrets:
+      - db-password
+    volumes:
+      - db-data:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_DB=example
+      - POSTGRES_PASSWORD_FILE=/run/secrets/db-password
+    expose:
+      - 5432
+    
+  proxy:
+    build: proxy
+    ports:
+      - 80:80
+    depends_on: 
+      - backend
+volumes:
+  db-data:
+secrets:
+  db-password:
+    file: db/password.txt