Fix nix build

[teodanciu]

Description

Add your description here, if it fixes a particular issue please provide a
link
to the issue.

Checklist

• Commit sequence broadly makes sense
• Commits have useful messages
• New tests are added if needed and existing tests are updated
• Any changes are noted in the changelog
• Code is formatted with fourmolu (use scripts/fourmolize.sh)
• Cabal files are formatted (use scripts/cabal-format.sh)
• hie.yaml has been updated (use scripts/gen-hie.sh)
• Self-reviewed the diff

[dermetfan]

I can confirm that this fixes the evaluation of nix-build -A checks which before this change reported:

error: undefined variable 'extra'

       at /mnt/cephfs/home/dermetfan/projects/development/IOHK/repos/cardano-ledger/nix/util.nix:9:12:

            8|
            9|   inherit (extra)
             |            ^
           10|     recRecurseIntoAttrs

The build itself still does not work though, reporting:

error: builder for '/nix/store/zmji7vwzdblg3vy3a1jbvcpn422l9rfc-cardano-ledger-conway-test-test-cardano-ledger-conway-test-1.0.0.0-check.drv' failed with exit code 1;
       last 10 log lines:
       >       Exception: cddl: createProcess: posix_spawnp: does not exist (No such file or directory)
       >       Use -p '/CDDL roundtrip CostModels/' to rerun this test only.
       >     CDDL roundtrip Redeemers (ConwayEra StandardCrypto):       FAIL
       >       Exception: cddl: createProcess: posix_spawnp: does not exist (No such file or directory)
       >       Use -p '/CDDL roundtrip Redeemers (ConwayEra StandardCrypto)/' to rerun this test only.
       >     CDDL roundtrip AlonzoTx (ConwayEra StandardCrypto):        FAIL
       >       Exception: cddl: createProcess: posix_spawnp: does not exist (No such file or directory)
       >       Use -p '/CDDL roundtrip AlonzoTx (ConwayEra StandardCrypto)/' to rerun this test only.
       >
       > 14 out of 17 tests failed (41.89s)

Not sure if that is in the scope of this PR though, so still approving as this does fix the evaluation.

[teodanciu]

That's interesting, thank you very much for checking @dermetfan . ( I tested with another derivation which worked, rather than all of them.. )
Looking into it now

[teodanciu]

This problem was unrelated to the iohk-nix update...rather nix-build -A tests.cardano-leder-conway-test never actually worked 😬
I think we have to have at least a nightly nix-build job running.