[build, devscripts] Add devscript to set a build variant

Closes #4471

.github/workflows/build.yml

@@ -89,6 +89,7 @@ jobs:
       if: "env.TWINE_PASSWORD != ''"
       run: |
         rm -rf dist/*
+        python devscripts/set-variant.py pip -M "You installed yt-dlp with pip or using the wheel from PyPi; Use that to update"
         python setup.py sdist bdist_wheel
         twine upload dist/*