Add coverage badge #64

Job	Run time
bullseye armv7 / build	14m 34s
bookworm armv7 / build	16m 5s
bullseye armv7 / test (run_install_common.sh)	14m 18s
bullseye armv7 / test (run_install_faststartup.sh)	9m 17s
bullseye armv7 / test (run_install_webapp_local.sh)	15m 2s
bullseye armv7 / test (run_install_webapp_download.sh)	15m 39s
bullseye armv7 / test (run_install_libzmq_local.sh)	23m 17s
bookworm armv7 / test (run_install_common.sh)	14m 21s
bookworm armv7 / test (run_install_faststartup.sh)	9m 38s
bookworm armv7 / test (run_install_webapp_local.sh)	14m 2s
bookworm armv7 / test (run_install_webapp_download.sh)	13m 54s
bookworm armv7 / test (run_install_libzmq_local.sh)	24m 46s
bullseye armv7 / cleanup	4s
bookworm armv7 / cleanup	7s
	3h 5m 4s

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