4.0.0 Beta 03

Changelog

• Sets up native support for SSH configuration. You can also use a third party client by passing in true to the ssh-key input. For clarity the ssh input has been deprecated.
• Points integration tests to the v4 branch.
• Improves the clean exclusion experience.
• All inputs are now lowercase to match other official actions.
• Inputs are now hyphenated instead of snaked, ie CLEAN_EXCLUDE is now clean-exclude.
• Updated security documents with the new release.

For all changes please refer to the README. For further discussion please refer to the v4 thread.