feat: add basic mqtt support #491

Job	Run time
bookworm armv7 / build	13m 21s
bullseye armv7 / build	12m 21s
bullseye armv7 / test (run_install_common.sh)	1h 39m 29s
bullseye armv7 / test (run_install_faststartup.sh)	1h 33m 48s
bullseye armv7 / test (run_install_webapp_local.sh)	1h 48m 39s
bullseye armv7 / test (run_install_webapp_download.sh)	1h 41m 22s
bullseye armv7 / test (run_install_libzmq_local.sh)	1h 45m 35s
bookworm armv7 / test (run_install_common.sh)	1h 39m 4s
bookworm armv7 / test (run_install_faststartup.sh)	1h 35m 28s
bookworm armv7 / test (run_install_webapp_local.sh)	1h 40m 46s
bookworm armv7 / test (run_install_webapp_download.sh)	1h 33m 23s
bookworm armv7 / test (run_install_libzmq_local.sh)	1h 47m 45s
bullseye armv7 / cleanup	3s
bookworm armv7 / cleanup	2s
	17h 11m 6s

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