refactor: update branch name

.github/workflows/Docker.yml

@@ -2,7 +2,7 @@ name: ci
 on:
   push:
     branches:
-      - 'docker_beta'
+      - 'main'
 
 jobs:
   docker:

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   server:
-    image: opensign/opensignserver:docker_beta
+    image: opensign/opensignserver:main
     container_name: OpenSignServer-container
     ports:
       - "8080:8080"
@@ -22,7 +22,7 @@ services:
     networks:
       - app-network
   client:
-    image: opensign/opensign:docker_beta
+    image: opensign/opensign:main
     container_name: OpenSign-container
     depends_on:
       - server