multi-arch-build (#2571)

### What problem does this PR solve?

Build multi-arch docker image `infiniflow/ragflow:poetry` on
`linux/amd64` and `linux/arm64`.

### Type of change

- [x] Refactoring

docker/docker-compose-base.yml

@@ -30,7 +30,8 @@ services:
     restart: always
 
   mysql:
-    image: mysql:5.7.18
+    # mysql:5.7 linux/arm64 image is unavailable.
+    image: mysql:8.0.39
     container_name: ragflow-mysql
     environment:
       - MYSQL_ROOT_PASSWORD=${MYSQL_PASSWORD}