Fixup location of boot cdrom repository #4274

Job	Run time
Unit tests (1.20.x)	25s
Lints	1m 34s
Unit tests (1.21.x)	3m 26s
Colima (v0.6.5)	3m 19s
Integration tests	35m 2s
VMNet test	18m 50s
Integration tests (on Linux) (alpine.yaml)	3m 11s
Windows tests	1m 58s
Integration tests (on Linux) (debian.yaml)	16m 31s
Integration tests (on Linux) (fedora.yaml)	6m 1s
Upgrade test (v0.15.1)	10m 52s
Integration tests (on Linux) (archlinux.yaml)	5m 39s
Integration tests (on Linux) (opensuse.yaml)	5m 33s
vz (experimental/vz.yaml)	12m 54s
Integration tests (on Linux) (experimental/net-user-v2.yaml)	3m 56s
vz (fedora.yaml)	18m 29s
Integration tests (on Linux) (docker.yaml)	4m 50s
	2h 32m 30s

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