GH26: Add support for installing Cake using tool manifest

[devlead]

• fixes #26

[nils-a]

@devlead isn't it kind of counter-intuitive to have mutually exclusive options cake-tool-manifest and cake-version?

What do you think of modifying the current cake-version property:

• add for consistency:

  # equivalent to the current default when cake-version is omitted
  # always uses the latest version
  cake-version: latest

• add instead of cake-tool-manifest

  # use version from manifest
  cake-version: tool-manifest # or manifest, from-manifest, something like that

  This could then, given some time, become the new default if cake-version is omitted.

[nils-a]

Also, documentation of the new feature is still missing.

[devlead]

@nils-a makes total sense, adjusted to cake-version parameter supporting tool-manifest

steps:
  - name: Run the Cake script
    uses: cake-build/cake-action@v1
    with:
      cake-version: tool-manifest

[devlead]

@ecampidoglio I've turned CakeVersion into a union type and incorporated your suggestions.

[nils-a]

I tested it - I love it 👍

[ecampidoglio]

Thank you for your contribution! 🎉

[devlead]

Thank you for your contribution! 🎉

Excellent 👍, can't wait for a release to take this for a spin 😎

[ecampidoglio]

@devlead You can try it right now by referencing master in your workflow:

uses: cake-build/cake-action@master

[devlead]

@devlead You can try it right now by referencing master in your workflow:

uses: cake-build/cake-action@master

That actually I knew :) I used my fork before merged and tried master after. But have a few repos to PR and those have policies of pinning versions.