ci: fetch latest installer from hydra #427

Job	Run time
push-paths (ubuntu-latest)	42s
push-paths (macos-latest)	1m 38s
public-cache-no-signing-key (ubuntu-latest, true)	38s
installCommand (ubuntu-latest)	43s
public-cache (ubuntu-latest, true)	46s
public-cache-no-signing-key (ubuntu-latest, false)	39s
installCommand (macos-latest)	2m 31s
public-cache (ubuntu-latest, false)	41s
nix-master (ubuntu-latest)	8s
public-cache-no-signing-key (macos-latest, true)	1m 46s
public-cache (macos-latest, true)	1m 45s
nix-master (macos-13)	1s
public-cache-no-signing-key (macos-latest, false)	2m 13s
public-cache (macos-latest, false)	1m 36s
private-cache	0s
	15m 47s

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