Allow zarf tools download-init to download a specific zarf version

[beholdenkey]

Is your feature request related to a problem? Please describe.

Currently, when using zarf tools download-init, it downloads the latest version. This can be problematic if we're building packages that aren't compatible with the latest version of Zarf. It would be beneficial to specify the version in the command:

zarf tools download-init -v v0.45.0

Describe the behavior you'd like

• Given a state

  zarf tools download-init -v v0.45.0

• When an action is taken

  When the -v or --version flags are passed

• Then something happens

  The desired version of Zarf is downloaded

Describe alternatives you've considered

Currently, the alternative is to use the gh CLI or curl. While that works, adding this functionality to zarf tools download-init would be more convenient.

[brandtkeller]

Thanks for the issue @beholdenkey - This does sound like a useful addition to the command.