Add flake template with check #14

Job	Run time
nix-flake-show-templates	23s
nix-unit	30s
nix-matrix	21s
nix-build (githubActions.checks.x86_64-linux."doc", ubuntu-22.04)	25s
nix-build (githubActions.checks.x86_64-linux."kitchenSinkA-pref-sdist", ubuntu-22.04)	49s
nix-build (githubActions.checks.x86_64-linux."kitchenSinkA-pref-wheel", ubuntu-22.04)	47s
nix-build (githubActions.checks.x86_64-linux."noDeps-pref-sdist", ubuntu-22.04)	29s
nix-build (githubActions.checks.x86_64-linux."noDeps-pref-wheel", ubuntu-22.04)	25s
nix-build (githubActions.checks.x86_64-linux."optionalDeps-pref-sdist", ubuntu-22.04)	27s
nix-build (githubActions.checks.x86_64-linux."optionalDeps-pref-wheel", ubuntu-22.04)	26s
nix-build (githubActions.checks.x86_64-linux."treefmt", ubuntu-22.04)	24s
nix-build (githubActions.checks.x86_64-linux."trivial-pref-sdist", ubuntu-22.04)	31s
nix-build (githubActions.checks.x86_64-linux."trivial-pref-wheel", ubuntu-22.04)	30s
nix-build (githubActions.checks.x86_64-linux."withExtra-pref-sdist", ubuntu-22.04)	34s
nix-build (githubActions.checks.x86_64-linux."withExtra-pref-wheel", ubuntu-22.04)	34s
nix-build (githubActions.checks.x86_64-linux."workspace-flat-pref-sdist", ubuntu-22.04)	27s
nix-build (githubActions.checks.x86_64-linux."workspace-flat-pref-wheel", ubuntu-22.04)	26s
nix-build (githubActions.checks.x86_64-linux."workspace-pref-sdist", ubuntu-22.04)	32s
nix-build (githubActions.checks.x86_64-linux."workspace-pref-wheel", ubuntu-22.04)	29s
collect	1s
deploy-pages	30s
	10m 0s

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