ci: add gh cache to nix action · coder/coder-desktop-macos@af99807

Failed to download action 'https://api.github.com/repos/nixbuild/nix-quick-install-action/tarball/5bb6a3b3abe66fd09bbf250dce8ada94f856a703'. Error: Operation timed out (api.github.com:443)

Back off 18.664 seconds before retry.

Tests Passed: 0 failed, 0 skipped, 0 total (0.001 seconds)