Add `skip_checkout`

To offer more flexibility for workflows where some setup must be done after checkout, e.g setup-python

Move the full process into the action to simplify consumers

Drops inputs owner and version in favour of repository and version_cmd

Initial release version

v1

Update README.md

Initial test 9

Update action.yml

See https://github.com/actions/runner/issues/1483

Initial test 8

0.0.8

Update action.yml

Initial test 7

0.0.7

Update action.yml

Initial test 6

0.0.6

Update action.yml

Initial test 5

0.0.5

Update action.yml

Initial test 4

0.0.4

Update action.yml

Initial test 3

0.0.3

Update action.yml