CI: add spell checker #5973

Job	Run time
Integration tests	14m 4s
Integration tests (on Linux) (alpine.yaml)	6m 6s
Integration tests (on Linux) (debian.yaml)	6m 26s
Integration tests (on Linux) (fedora.yaml)	6m 23s
Integration tests (on Linux) (opensuse.yaml)	7m 51s
Integration tests (on Linux) (docker.yaml)	7m 22s
Integration tests (on Linux) (../hack/test-templates/alpine-iso-9p-writable.yaml)	5m 58s
Integration tests (on Linux) (../hack/test-templates/net-user-v2.yaml)	8m 49s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	19m 40s
Lints	1m 59s
Spell check	8s
Unit tests (1.22.x)	56s
Unit tests (1.23.x)	3m 55s
Windows tests	2m 21s
Upgrade test (v0.15.1)	13m 51s
Colima (v0.6.5)	6m 38s
VMNet test	11m 0s
vz (default.yaml)	10m 41s
vz (fedora.yaml)	9m 40s
	2h 23m 48s

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