feat: systemd unit for zia-client in deb package #2

Job	Run time
build (x86_64-unknown-linux-gnu, static)	1m 43s
build (x86_64-unknown-linux-gnu, dynamic)	3m 4s
build (aarch64-unknown-linux-gnu, static)	1m 44s
build (aarch64-unknown-linux-gnu, dynamic)	3m 10s
build (armv7-unknown-linux-gnueabihf, static)	1m 53s
build (armv7-unknown-linux-gnueabihf, dynamic)	3m 30s
build (aarch64-linux-android, static)	1m 56s
build (aarch64-linux-android, dynamic)	3m 17s
build-native (windows)	2m 10s
build-docker (client)	39s
build-native (macos)	46s
build-docker (server)	23s
	24m 15s

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