remove bullseye from test; common step to activate venv #956

Job	Run time
pack_deb	3m 31s
pack_pip	11s
pack_rpm (fedora, 34)	1m 12s
pack_rpm (fedora, 35)	1m 5s
pack_rpm (fedora, 36)	1m 16s
run_tests_pip_package_windows	8m 15s
run_tests_pip_package_linux	2m 30s
run_tests_rpm (fedora, 34)	5m 9s
run_tests_rpm (fedora, 35)	4m 45s
run_tests_rpm (fedora, 36)	4m 44s
run_tests_deb (debian, bookworm)	52s
run_tests_deb (ubuntu, focal)	54s
run_tests_deb (ubuntu, jammy)	51s
run_tests_deb (ubuntu, noble)	51s
publish_deb	0s
publish_rpm	0s
publish_pip	1s
	36m 7s

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