Read from version file `atmos-version-file`

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Describe the Feature

Similar to https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#using-the-python-version-file-input

I have the atmos version supplied in multiple places. It would be nice to have it in a single place such as with a .python-version file or .atmos-version file or perhaps support the asdf file .tool-versions

e.g.

  - name: Setup atmos
    uses: cloudposse/github-action-setup-atmos@v2
    with:
      install-wrapper: true
      atmos-version-file: .atmos-version

Expected Behavior

Centralized place for atmos version

Use Case

See above

Describe Ideal Solution

See above

Alternatives Considered

Create a repo .atmos-version
Use a github action to read its contents and save the version to an output
Then read the output in this action

Additional Context

N/A