Convert flakehub: true to determinate: true (#123) #517

Job	Run time
Install Nix using non-default source-url	9s
Check the dist/ folder is up to date	1m 16s
Install Nix without an ID token	18s
Install Nix using non-default source-revision	13s
Test: ubuntu-latest with determinate	2m 16s
Test: ubuntu-latest	2m 2s
Test: nscloud-ubuntu-22.04-amd64-4x16 with determinate	2m 28s
Test: nscloud-ubuntu-22.04-amd64-4x16	2m 12s
Test: namespace-profile-default-arm64 with determinate	3m 3s
Test: namespace-profile-default-arm64	2m 34s
Test: macos-13-large with determinate	6m 59s
Test: macos-13-large	7m 26s
Test: macos-14-large with determinate	8m 59s
Test: macos-14-large	7m 13s
Test: macos-14-xlarge with determinate	3m 34s
Test: macos-14-xlarge	3m 45s
tests	0s
	54m 27s

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