Umbraco Cloud/Deploy: Create "Adding to Git" Extension Point

[Nicholas-Westby]

Søren Kottal created this issue on the old tracker and I'm porting it over with some new information: https://issues.umbraco.org/issue/UAAS-649

In essence, if somebody makes a change in a third-party package that causes a file to be created/modified/deleted, it would be nice if Umbraco Deploy or Umbraco Cloud allowed that file to be committed directly to the Umbraco Cloud Git repository.

It seems like this should in essence be possible, as it already happens with document types (i.e., if you create a document type on dev/live, it will be added to the Git repository immediately). Exposing this functionality publicly and documenting it would be nice.

My use case is that I have a package that creates files that are structural in nature (similar to document types, but stored purely on the file system without a database counterpart), which you can read about here: https://our.umbraco.com/forum/umbraco-cloud/95107-transferring-non-content-with-umbraco-deploy