feat(dns): server support user provided cert #2349

Job	Run time
x86_64-unknown-linux-gnu	2m 55s
i686-unknown-linux-gnu	1s
x86_64-unknown-linux-musl	2m 57s
x86_64-unknown-linux-gnu-static-crt	2m 57s
i686-unknown-linux-gnu-static-crt	2m 57s
aarch64-unknown-linux-gnu	2m 59s
armv7-unknown-linux-gnueabi	2m 58s
armv7-unknown-linux-gnueabihf	2m 58s
aarch64-unknown-linux-musl	2m 59s
armv7-unknown-linux-musleabihf	2m 57s
aarch64-unknown-linux-gnu-static-crt	2m 58s
armv7-unknown-linux-gnueabi-static-crt	3m 3s
x86_64-pc-windows-msvc	1s
i686-pc-windows-msvc	2m 55s
aarch64-pc-windows-msvc	2m 51s
x86_64-pc-windows-msvc-static-crt	1s
i686-pc-windows-msvc-static-crt	2m 55s
aarch64-pc-windows-msvc-static-crt	2m 55s
x86_64-apple-darwin	2m 57s
aarch64-apple-darwin	2m 59s
x86_64-apple-darwin-static-crt	2m 56s
aarch64-apple-darwin-static-crt	2m 59s
Docker Image	1s
Release	1s
	56m 10s

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