installation: untar libzmq in venv folder instead of /usr/local #371

Job	Run time
bookworm armv7 / build	1m 40s
bullseye armv7 / build	1m 28s
bullseye armv7 / test (run_install_common.sh)	14m 20s
bullseye armv7 / test (run_install_faststartup.sh)	10m 7s
bullseye armv7 / test (run_install_webapp_local.sh)	21m 55s
bullseye armv7 / test (run_install_webapp_download.sh)	14m 4s
bullseye armv7 / test (run_install_libzmq_local.sh)	23m 34s
bookworm armv7 / test (run_install_common.sh)	14m 8s
bookworm armv7 / test (run_install_faststartup.sh)	11m 44s
bookworm armv7 / test (run_install_webapp_local.sh)	22m 32s
bookworm armv7 / test (run_install_webapp_download.sh)	13m 54s
bookworm armv7 / test (run_install_libzmq_local.sh)	24m 58s
bullseye armv7 / cleanup	4s
bookworm armv7 / cleanup	5s
	2h 54m 33s

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