nixos/step-ca: use `pathWith` for `intermediatePasswordFile`

This lets us remove an assertion, because `pathWith` can require that a
file not be in the store.

Note that the old assertion didn't quite do what we wanted: it prevented
you from using top level store paths (such as
`/nix/store/gg8578vvbcf1wpqvk85bigi5s4pvylkk-test-certificates`), but was
ok with sub-files (such as
`/nix/store/gg8578vvbcf1wpqvk85bigi5s4pvylkk-test-certificates/intermediate-password-file`).

Now that we're stricter, we need some way to populate
`intermediatePasswordFile` in our test without making the type unhappy.
I opted to solve that by creating a file in `/etc`.

0 files changed, 0 insertions, 0 deletions