fix: add libyaml-dev dependency for apt. (#11291) #191

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	27m 49s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	28m 47s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	25m 54s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	25m 48s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	28m 12s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	28m 8s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	23m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	25m 52s
	3h 34m 9s

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