feat: --private-key option should not only support paths

[robingenz]

It should be possible to pass the private key directly when using the --private-key option.

Example:

- name: Create a bundle on Capawesome Cloud
  run: npx capawesome apps:bundles:create --appId "..." --path www --private-key ${{ secrets.CAPAWESOME_CLOUD_PRIVATE_KEY }}

[robingenz]

Update: Unfortunately, this is currently not possible because citty interprets strings that start with - as booleans.

{
  _: [],
  'private-key': true,
  B: true,
  E: true,
  G: true,
  I: true,
  N: true
}