Allow inputs for type = "flake"

[Ma27]

Description

Needed for Hydra instances using NixOS/hydra#922

Note: please don't merge until the linked PR is accepted in nixos/hydra :)

Checklist

• Built with make build
• Formatted with make fmt
• Verifed the example configuration still parses with terraform init && terraform validate (you may need to make install from the root of the project)
• Ran acceptance tests with HYDRA_HOST=http://0.0.0.0:63333 HYDRA_USERNAME=alice HYDRA_PASSWORD=foobar make testacc (you will need to spin up a local / temporary instance of Hydra)
• Added or updated relevant documentation (leave unchecked if not applicable)

[grahamc]

I'm a bit surprised there aren't failing tests, but perhaps there are and they aren't caught by CI. Looks like a good patch once hydra#922 is merged, thanks!

[Ma27]

I see :) is there anything else tbd to get this (and previously hydra#922) merged? :)