feat: add basic mqtt support #441

Job	Run time
bullseye armv7 / build	13m 34s
bookworm armv7 / build	13m 8s
bookworm armv7 / test (run_install_common.sh)	13m 53s
bookworm armv7 / test (run_install_faststartup.sh)	10m 40s
bookworm armv7 / test (run_install_webapp_local.sh)	19m 52s
bookworm armv7 / test (run_install_webapp_download.sh)	14m 6s
bookworm armv7 / test (run_install_libzmq_local.sh)	24m 51s
bullseye armv7 / test (run_install_common.sh)	13m 12s
bullseye armv7 / test (run_install_faststartup.sh)	10m 35s
bullseye armv7 / test (run_install_webapp_local.sh)	20m 20s
bullseye armv7 / test (run_install_webapp_download.sh)	13m 43s
bullseye armv7 / test (run_install_libzmq_local.sh)	23m 51s
bullseye armv7 / cleanup	4s
bookworm armv7 / cleanup	2s
	3h 11m 51s

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