CI: Fix chart testing. (#12257) #40

Job	Run time
changes	4s
Chart / Lint	39s
Build	4m 6s
lua-lint	4s
test-go	3m 52s
Verify Doc generation	10s
Chart / Test (v1.28.13)	12m 9s
Chart / Test (v1.29.8)	11m 40s
Chart / Test (v1.30.4)	12m 3s
Chart / Test (v1.31.0)	11m 24s
Kubernetes (v1.28.13) / Kubernetes	45m 13s
Kubernetes (v1.29.8) / Kubernetes	51m 34s
Kubernetes (v1.30.4) / Kubernetes	46m 30s
Kubernetes (v1.31.0) / Kubernetes	45m 50s
Kubernetes chroot (v1.29.8) / Kubernetes CHROOT	45m 1s
Kubernetes chroot (v1.28.13) / Kubernetes CHROOT	46m 19s
Kubernetes chroot (v1.30.4) / Kubernetes CHROOT	46m 21s
Kubernetes chroot (v1.31.0) / Kubernetes CHROOT	45m 56s
	7h 8m 55s

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