Parameterize the build artifacts to make downloading easier

[mocleiri]

When I download multiple artifacts I get so many same dir (1), same dir (2), .. same dir (n).

Lets use this example to make a nightly build that has the build id on the name: https://stackoverflow.com/a/60942437/140424

We can also look at how the naming convention is done with the micropython autobuild scripts.