daemon: fix support check in post run #363

Job	Run time
nix-master (ubuntu-latest)	1m 10s
public-cache (ubuntu-latest, true)	1m 6s
nix-master (macos-latest)	4m 3s
installCommand (ubuntu-latest)	1m 4s
public-cache (ubuntu-latest, false)	1m 6s
private-cache	0s
public-cache (macos-latest, true)	4m 7s
installCommand (macos-latest)	3m 31s
public-cache (macos-latest, false)	4m 47s
public-cache-no-signing-key (ubuntu-latest, true)	1m 0s
public-cache-no-signing-key (ubuntu-latest, false)	59s
public-cache-no-signing-key (macos-latest, true)	2m 50s
public-cache-no-signing-key (macos-latest, false)	2m 50s
	28m 33s

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