nix: Add `om init` template params #1140

Job	Run time
configure	2s
nix (x86_64-linux, dev)	6s
nix (x86_64-linux, doc)	20s
nix (x86_64-linux, example)	6s
nix (x86_64-linux, haskell-parsers-test)	4s
nix (x86_64-linux, test-otherOverlays)	17s
nix (x86_64-linux, test-project-module)	16s
nix (x86_64-linux, test-settings-defaults)	17s
nix (x86_64-linux, test-simple)	16s
nix (x86_64-linux, test-with-subdir)	19s
nix (x86_64-darwin, dev)	1s
nix (x86_64-darwin, doc)	1s
nix (x86_64-darwin, example)	1s
nix (x86_64-darwin, haskell-parsers-test)	1s
nix (x86_64-darwin, test-otherOverlays)	1s
nix (x86_64-darwin, test-project-module)	1s
nix (x86_64-darwin, test-settings-defaults)	1s
nix (x86_64-darwin, test-simple)	1s
nix (x86_64-darwin, test-with-subdir)	1s
nix (aarch64-darwin, dev)	18s
nix (aarch64-darwin, doc)	1m 31s
nix (aarch64-darwin, example)	42s
nix (aarch64-darwin, haskell-parsers-test)	14s
nix (aarch64-darwin, test-otherOverlays)	3m 3s
nix (aarch64-darwin, test-project-module)	3m 2s
nix (aarch64-darwin, test-settings-defaults)	3m 29s
nix (aarch64-darwin, test-simple)	3m 23s
nix (aarch64-darwin, test-with-subdir)	3m 34s
	21m 28s

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