fix zones constrains list parsing

[luissimas]

Description

Closes #1050. This fixes the parsing of the zones constraint in bundles. The format in the Juju API is defined in: https://github.com/juju/juju/blob/3.6/core/constraints/constraints.go#L107.

QA Steps

The following python script can be used to verify both the bug in the current version as well as the fix implemented:

import asyncio
from juju.model import Model

bundle_file = "./bundle.yaml"

bundle = """
name: sample-bundle

series: jammy

machines:
  "0":
    constraints: zones=z-1

applications:
  postgresql:
    charm: postgresql
    channel: 14/stable
    num_units: 1
    to:
      - lxd:0
"""

async def main():
    with open(bundle_file, "w") as f:
        f.write(bundle)

    model = Model()
    await model.connect()
    await model.deploy(bundle_file)

asyncio.run(main())

All CI tests need to pass.

[jujubot]

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@hpidcock @anvial

[jujubot]

Thanks for opening a pull request! Please follow the instructions here to ensure your pull request is ready for review. Then, a maintainer will review your patch.

@hpidcock @anvial

[luissimas]

Closing this one in favor of #1054 since it's merging from its own branch instead of master.