deploy: prefix staging container names

docker-compose.deploy.yml

@@ -1,7 +1,7 @@
 services:
   asn-header:
     image: gitea.mindboost.team/mindboost/education-flagger-header:${IMAGE_TAG}
-    container_name: asn-header
+    container_name: staging-asn-header
     restart: unless-stopped
     env_file: .env
     environment:
@@ -21,7 +21,7 @@ services:
 
   asn-updater:
     image: gitea.mindboost.team/mindboost/education-flagger-updater:${IMAGE_TAG}
-    container_name: asn-updater
+    container_name: staging-asn-updater
     restart: unless-stopped
     env_file: .env
     healthcheck:
@@ -42,3 +42,4 @@ networks:
 
 volumes:
   asn_data:
+    name: staging_asn_data