Build and publish container images

add recipe for Ubuntu 20.04 container with Python 2.7 #97

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Run time

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Job	Run time
Build/publish (centos-7.9-python3)	4m 40s
Build/publish (centos-7.9)	6m 11s
Build/publish (centos-8.5)	8m 56s
Build/publish (centosstream-9)	10m 2s
Build/publish (fedora-35)	25m 39s
Build/publish (fedora-36)	29m 42s
Build/publish (opensuse-15.3)	12m 6s
Build/publish (opensuse-15.4)	9m 25s
Build/publish (rockylinux-8.5)	6m 38s
Build/publish (rockylinux-8.6)	6m 26s
Build/publish (rockylinux-8.7)	4m 45s
Build/publish (rockylinux-8.8)	1m 5s
Build/publish (rockylinux-9.0)	8m 8s
Build/publish (rockylinux-9.1)	6m 53s
Build/publish (rockylinux-9.2)	1m 15s
Build/publish (almalinux-8.6)	4m 48s
Build/publish (almalinux-9.0)	7m 45s
Build/publish (ubuntu-20.04)	6m 14s
Build/publish (ubuntu-20.04-python2)	46s
Build/publish (ubuntu-22.04)	6m 49s
	2h 48m 13s