chore(*): adopt project templates

backend/docker-compose.override.yml.example

@@ -0,0 +1,15 @@
+services:
+  api:
+    networks:
+      default: {}
+      caddy:
+        aliases:
+          - beavergram-api
+
+  postgres:
+    ports:
+      - "127.0.0.1:${DB__PORT:-5432}:5432"
+
+networks:
+  caddy:
+    external: true