I'll probably use self hosted runners in a project and the Community
version of Visual Studio will be installed on those. This enables the
script to check for Community and Professional editions in addition
to the Entreprise one offered by GitHub.
The modification generates a kinda search map ordered by version then
by edition. It generates the batch script that runs vcvarsall.bat
on the fly given that search map.
Again, this is a squashed commit with around three hours of attempts
to write something working. See comments in the file for more details.
I'm too lazy to document this stuff properly.
Now that I know how to write some simple action, let's make a stub
more complete. For example, I already know what inputs I would like
to handle for this action.