bug: SNI certificate must re-upload from dashboard when apisix reload

[Mararesliu]

Current Behavior

SNI certificate must re-upload from dashboard when apisix reload

Expected Behavior

SNI certificate no need re-upload when apisix reload or restart

Error Logs

No response

Steps to Reproduce

1、Enabbled https, set SNI certificate from dashboard
2、apisix reload
3、visit the domain url route failed
4、re-upload certificate would be dealed

Environment

• APISIX version (run apisix version):2.15.2
• Operating system (run uname -a): 3.10.0-1160.59.1.el7.x86_64
• OpenResty / Nginx version (run openresty -V or nginx -V):
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info): 3.4.0
• APISIX Dashboard version, if relevant: 3.0.0
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version): 2.3.0

[alptugay]

I think it is because yor dashboard version and Apisix version is not compatible.
See: apache/apisix-dashboard#2693