Add a test of create-cardano

[smelc]

Changelog

- description: |
    Add a test of create-cardano
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - refactoring    # QoL changes
  # - bugfix         # fixes a defect
  - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

Since I'm going to share some code between create-cardano and create-testnet-data (for #765), I thought this was a good occasion to at least call create-cardano once in our tests. It's bad to provide a command and not test it at all.

How to trust this PR

The new test passes

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff

[carbolymer]

there's already genesis in cardano-cli/test/cardano-cli-test/files/input/alonzo/genesis.alonzo.spec.json - why not reuse it?

[carbolymer]

I think it would be better to put it in cardano-cli/test/cardano-cli-test/files/input/byron/genesis.byron.spec.json

[carbolymer]

Same we already have conway genesis in repo

[carbolymer]

Same, we already have shelley genesis in cardano-cli/test/cardano-cli-test/files/input/shelley/genesis/genesis.spec.json