Executing deployment on workflow_dispatch

[garyThrels]

Currently this action is only useable if we deploy when opening or closing a PR. We would like to use it with manual workflow dispatching, since we do not want to dispatch for every PR, just the ones we choose.

We were also looking to implement the deletion of the site on deletion of the branch instead of the PR closing.

Would nice to have this kind of functionality, and not depend on just pull request open or close.
Finally showing an error should the github action on not be supported would be nice, as we ended up using quite some time figuring why it was not dispatching