future3 - allow custom username #5

Job	Run time
bookworm / build	14m 47s
bullseye / build	14m 54s
bookworm / test (run_install_common.sh)	11m 48s
bookworm / test (run_install_faststartup.sh)	10m 18s
bookworm / test (run_install_webapp_local.sh)	11m 49s
bookworm / test (run_install_webapp_download.sh)	11m 47s
bullseye / test (run_install_common.sh)	11m 40s
bullseye / test (run_install_faststartup.sh)	9m 25s
bullseye / test (run_install_webapp_local.sh)	11m 39s
bullseye / test (run_install_webapp_download.sh)	11m 40s
bullseye / cleanup	3s
bookworm / cleanup	2s
	1h 59m 52s

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