Build: Always use local `tmp` dir on macOS. (#12741) #11970

Job	Run time
changes	6s
Build	13m 36s
test-go	4m 15s
Verify Doc generation	16s
lua-lint	4s
Chart / Lint	33s
Chart / Test (v1.28.15)	11m 17s
Chart / Test (v1.29.12)	11m 37s
Chart / Test (v1.30.8)	11m 39s
Chart / Test (v1.31.4)	11m 33s
Chart / Test (v1.32.0)	11m 12s
Kubernetes (v1.28.15) / Kubernetes	45m 12s
Kubernetes (v1.29.12) / Kubernetes	45m 36s
Kubernetes (v1.30.8) / Kubernetes	45m 59s
Kubernetes (v1.31.4) / Kubernetes	52m 46s
Kubernetes (v1.32.0) / Kubernetes	52m 32s
Kubernetes chroot (v1.28.15) / Kubernetes CHROOT	45m 20s
Kubernetes chroot (v1.29.12) / Kubernetes CHROOT	45m 37s
Kubernetes chroot (v1.30.8) / Kubernetes CHROOT	45m 9s
Kubernetes chroot (v1.31.4) / Kubernetes CHROOT	44m 58s
Kubernetes chroot (v1.32.0) / Kubernetes CHROOT	45m 46s
	9h 5m 3s

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