Merge pull request #2795 from AkihiroSuda/ubuntu-old #8

Job	Run time
Colima (v0.6.5)	5m 9s
Integration tests	19m 7s
Integration tests (on Linux) (alpine.yaml)	9m 3s
Integration tests (on Linux) (debian.yaml)	7m 50s
Lints	4m 41s
Integration tests (on Linux) (fedora.yaml)	8m 26s
Spell check	9s
Integration tests (on Linux) (opensuse.yaml)	8m 53s
Unit tests (1.22.x)	5m 49s
Upgrade test (v0.15.1)	20m 16s
Integration tests (on Linux) (docker.yaml)	12m 32s
VMNet test	17m 2s
Unit tests (1.23.x)	5m 39s
Integration tests (on Linux) (../hack/test-templates/alpine-iso-9p-writable.yaml)	6m 40s
Integration tests (on Linux) (../hack/test-templates/net-user-v2.yaml)	7m 57s
vz (default.yaml)	1s
Windows tests	1s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	20m 5s
vz (fedora.yaml)	1s
	2h 39m 21s

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