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include ubuntu-20.04-python2 container in README #101

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Run time

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Job	Run time
Build/publish (centos-7.9-python3)	4m 20s
Build/publish (centos-7.9)	5m 1s
Build/publish (centos-8.5)	8m 4s
Build/publish (centosstream-9)	8m 40s
Build/publish (fedora-35)	23m 33s
Build/publish (fedora-36)	32m 31s
Build/publish (opensuse-15.3)	8m 52s
Build/publish (opensuse-15.4)	9m 32s
Build/publish (rockylinux-8.5)	5m 54s
Build/publish (rockylinux-8.6)	6m 29s
Build/publish (rockylinux-8.7)	4m 48s
Build/publish (rockylinux-8.8)	57s
Build/publish (rockylinux-9.0)	9m 8s
Build/publish (rockylinux-9.1)	8m 59s
Build/publish (rockylinux-9.2)	1m 16s
Build/publish (almalinux-8.6)	4m 37s
Build/publish (almalinux-9.0)	10m 6s
Build/publish (ubuntu-20.04)	6m 27s
Build/publish (ubuntu-20.04-python2)	1m 2s
Build/publish (ubuntu-22.04)	4m 37s
	2h 44m 53s