ci: fix latest installer tests #569

Job	Run time
extra-nix-config (ubuntu-latest)	35s
flakes (ubuntu-latest)	59s
extra-nix-config (macos-latest)	1m 16s
act-support (ubuntu-latest)	1m 42s
flakes (macos-latest)	1m 32s
custom-nix-path (ubuntu-latest)	37s
extra-nix-config (macos-13)	2m 11s
flakes (macos-13)	2m 40s
custom-nix-path (macos-latest)	1m 14s
latest-installer (ubuntu-latest, x86_64-linux)	42s
custom-nix-path (macos-13)	1m 58s
oldest-supported-installer (ubuntu-latest)	25s
latest-installer (macos-latest, aarch64-darwin)	1m 28s
simple-build (ubuntu-latest)	40s
oldest-supported-installer (macos-latest)	1m 9s
latest-installer (macos-13, x86_64-darwin)	2m 31s
simple-build (macos-latest)	1m 27s
oldest-supported-installer (macos-13)	1m 58s
simple-build (macos-13)	2m 20s
	27m 24s

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