feat: add support for "system" ssl_trusted_certificate #937

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/http3/admin)	4m 15s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	4m 24s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	4m 23s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	4m 23s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	4m 23s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/http3/admin)	4m 23s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	4m 24s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	4m 25s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	4m 25s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	4m 25s
	43m 50s

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