Add coverage badge #63

Job	Run time
bullseye armv7 / build	14m 47s
bookworm armv7 / build	15m 41s
bullseye armv7 / test (run_install_common.sh)	13m 58s
bullseye armv7 / test (run_install_faststartup.sh)	9m 36s
bullseye armv7 / test (run_install_webapp_local.sh)	15m 47s
bullseye armv7 / test (run_install_webapp_download.sh)	15m 0s
bullseye armv7 / test (run_install_libzmq_local.sh)	23m 5s
bookworm armv7 / test (run_install_common.sh)	14m 7s
bookworm armv7 / test (run_install_faststartup.sh)	9m 23s
bookworm armv7 / test (run_install_webapp_local.sh)	14m 38s
bookworm armv7 / test (run_install_webapp_download.sh)	14m 7s
bookworm armv7 / test (run_install_libzmq_local.sh)	24m 7s
bullseye armv7 / cleanup	3s
bookworm armv7 / cleanup	2s
	3h 4m 21s

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