git: ignore .cache file #175

Job	Run time
linux/fedora:41/admin / bootstrap	18s
linux/fedora:40/admin / bootstrap	3m 16s
linux/fedora:41/dev_single / bootstrap	17s
linux/fedora:40/dev_single / bootstrap	3m 33s
macos/macos-14/admin / bootstrap	4m 55s
linux/archlinux:latest/admin / bootstrap	4m 59s
linux/archlinux:latest/dev_single / bootstrap	4m 53s
macos/macos-14/dev_single / bootstrap	34s
macos/macos-13/admin / bootstrap	10m 39s
macos/macos-13/dev_single / bootstrap	1m 7s
	34m 31s

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