feat: add basic mqtt support #473

Job	Run time
bookworm armv7 / build	13m 25s
bullseye armv7 / build	12m 34s
bullseye armv7 / test (run_install_common.sh)	13m 31s
bullseye armv7 / test (run_install_faststartup.sh)	9m 35s
bullseye armv7 / test (run_install_webapp_local.sh)	20m 29s
bullseye armv7 / test (run_install_webapp_download.sh)	14m 11s
bullseye armv7 / test (run_install_libzmq_local.sh)	23m 56s
bookworm armv7 / test (run_install_common.sh)	14m 14s
bookworm armv7 / test (run_install_faststartup.sh)	10m 20s
bookworm armv7 / test (run_install_webapp_local.sh)	20m 1s
bookworm armv7 / test (run_install_webapp_download.sh)	13m 7s
bookworm armv7 / test (run_install_libzmq_local.sh)	25m 16s
bullseye armv7 / cleanup	2s
bookworm armv7 / cleanup	3s
	3h 10m 44s

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