Add coverage badge (#2153) #73

Job	Run time
bullseye armv7 / build	3m 26s
bookworm armv7 / build	4m 5s
bullseye armv7 / test (run_install_common.sh)	14m 1s
bullseye armv7 / test (run_install_faststartup.sh)	9m 23s
bullseye armv7 / test (run_install_webapp_local.sh)	15m 29s
bullseye armv7 / test (run_install_webapp_download.sh)	18m 12s
bullseye armv7 / test (run_install_libzmq_local.sh)	22m 59s
bookworm armv7 / test (run_install_common.sh)	14m 23s
bookworm armv7 / test (run_install_faststartup.sh)	10m 16s
bookworm armv7 / test (run_install_webapp_local.sh)	13m 54s
bookworm armv7 / test (run_install_webapp_download.sh)	13m 55s
bookworm armv7 / test (run_install_libzmq_local.sh)	25m 13s
bullseye armv7 / cleanup	2s
bookworm armv7 / cleanup	2s
	2h 45m 20s

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