feat: add basic mqtt support #495

Job	Run time
bookworm armv7 / build	12m 49s
bullseye armv7 / build	12m 16s
bullseye armv7 / test (run_install_common.sh)	13m 26s
bullseye armv7 / test (run_install_faststartup.sh)	9m 43s
bullseye armv7 / test (run_install_webapp_local.sh)	20m 30s
bullseye armv7 / test (run_install_webapp_download.sh)	14m 10s
bullseye armv7 / test (run_install_libzmq_local.sh)	23m 32s
bookworm armv7 / test (run_install_common.sh)	14m 6s
bookworm armv7 / test (run_install_faststartup.sh)	10m 15s
bookworm armv7 / test (run_install_webapp_local.sh)	19m 18s
bookworm armv7 / test (run_install_webapp_download.sh)	12m 36s
bookworm armv7 / test (run_install_libzmq_local.sh)	24m 46s
bullseye armv7 / cleanup	4s
bookworm armv7 / cleanup	3s
	3h 7m 34s

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