nixos/tests/gitea: test gpg commit signing key

`/api/v1/signing-key.gpg` spawns a `gpg` process,
which is great to test if `gpg` is available
and can be invoked from in the unit.

Which is somewhat relevant, since `gpg` was
missing from the unit's `$PATH` until recently.

And even after adding `gpg` to the unit's `$PATH`,
configuring commit signing for a instance
resulted in http/500s nonetheless.

That's due to `@memlock` being present in
`SystemCallFilter=~` and `gpg` trying to
use `mlock` (probably to prevent secrets
in the memory to swap), resulting in an
immediate `SIGKILL` of any spawned `gpg` processes.

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