[Docs] Inform about Python venv (#2147) #48

Job	Run time
bullseye armv7 / build	3m 31s
bookworm armv7 / build	4m 18s
bullseye armv7 / test (run_install_common.sh)	14m 25s
bullseye armv7 / test (run_install_faststartup.sh)	9m 2s
bullseye armv7 / test (run_install_webapp_local.sh)	15m 5s
bullseye armv7 / test (run_install_webapp_download.sh)	13m 52s
bullseye armv7 / test (run_install_libzmq_local.sh)	22m 46s
bookworm armv7 / test (run_install_common.sh)	13m 46s
bookworm armv7 / test (run_install_faststartup.sh)	9m 27s
bookworm armv7 / test (run_install_webapp_local.sh)	13m 40s
bookworm armv7 / test (run_install_webapp_download.sh)	13m 54s
bookworm armv7 / test (run_install_libzmq_local.sh)	23m 55s
bullseye armv7 / cleanup	3s
bookworm armv7 / cleanup	2s
	2h 37m 46s

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