Clarify github actions workflows naming

[emileten]

• This file is called test.yaml, and the action is called Test and Build, but is any test happening there? I don't see any. I suggest using respectively run_build.yaml and run_build.

• I suggest adding 'release' to the file name and the workflow name of this one, because it wasn't easy for me to find where the release happens.

• This one is called tox.yaml and the action is called tox. I suggest using test.yaml and test. Not everyone knows what tox is and does, and here we use it to run tests it seems?

[emileten]

I tried to marginally improve things in #69