nixpkgs Python tools changed to no longer set PYTHONHOME for us
automatically.

overrides

They're not necessary on newly selected nixpkgs revision.

The layer above will have to make sure that it is.

Bump to ZKAPAuthorizer that fixes the Ristretto thing.

This gives us the merged version of Ristretto support.

Add Ristretto to the end-to-end system test.

also, make it work.

This format for the file can be generated automatically using something like:

  nix-prefetch-github \
    --nix \
    --rev $(git rev-parse HEAD) \
    PrivateStorageio ZKAPAuthorizer > /path/to/zkapauthorizer-repo.nix

run in in a checkout of ZKAPAuthorizer

Let us pick Ristretto and supply a key if we like.

also if get-passes fails dump the tahoe logs

it needs the plugin too

only useful for debugging failed test runs

at least, maybe.  we don't actually get any zkaps from this as of now.

Put it into a language that I can more easily maintain

The issuer runs.  Helpers to poke the right API calls into the right place
forthcoming...