[Docs] Inform about Python venv #47

Job	Run time
bookworm armv7 / build	14m 43s
bullseye armv7 / build	13m 59s
bullseye armv7 / test (run_install_common.sh)	13m 58s
bullseye armv7 / test (run_install_faststartup.sh)	9m 30s
bullseye armv7 / test (run_install_webapp_local.sh)	15m 0s
bullseye armv7 / test (run_install_webapp_download.sh)	14m 40s
bullseye armv7 / test (run_install_libzmq_local.sh)	23m 19s
bookworm armv7 / test (run_install_common.sh)	14m 32s
bookworm armv7 / test (run_install_faststartup.sh)	10m 4s
bookworm armv7 / test (run_install_webapp_local.sh)	14m 41s
bookworm armv7 / test (run_install_webapp_download.sh)	14m 33s
bookworm armv7 / test (run_install_libzmq_local.sh)	24m 11s
bullseye armv7 / cleanup	2s
bookworm armv7 / cleanup	2s
	3h 3m 14s

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