feat(dns): server support user provided cert #2348

Job	Run time
x86_64-unknown-linux-gnu	1m 17s
i686-unknown-linux-gnu	1m 19s
x86_64-unknown-linux-musl	1m 18s
x86_64-unknown-linux-gnu-static-crt	1m 18s
i686-unknown-linux-gnu-static-crt	1m 18s
aarch64-unknown-linux-gnu	1m 17s
armv7-unknown-linux-gnueabi	1m 18s
armv7-unknown-linux-gnueabihf	1m 19s
aarch64-unknown-linux-musl	1m 19s
armv7-unknown-linux-musleabihf	1m 19s
aarch64-unknown-linux-gnu-static-crt	1m 18s
armv7-unknown-linux-gnueabi-static-crt	1m 18s
x86_64-pc-windows-msvc	1s
i686-pc-windows-msvc	1s
aarch64-pc-windows-msvc	1m 15s
x86_64-pc-windows-msvc-static-crt	1s
i686-pc-windows-msvc-static-crt	1s
aarch64-pc-windows-msvc-static-crt	1m 20s
x86_64-apple-darwin	1m 19s
aarch64-apple-darwin	1m 20s
x86_64-apple-darwin-static-crt	1m 18s
aarch64-apple-darwin-static-crt	1m 20s
Docker Image	1s
Release	1s
	23m 36s

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