`om hack`: Auto `cachix use` missing cachix caches #1290

Job	Run time
main (x86_64-linux, false)	3m 4s
main (aarch64-darwin, false)	6m 21s
static-binary-check (ubuntu-latest)	11s
website	0s
static-binary-check (macos-latest)	7s
	9m 43s

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