add pip install for windows/mac/ubuntu

Author: srbhp

.github/workflows/pip-matrix.yml

@@ -31,7 +31,7 @@ jobs:
         date > generated.txt
         git config user.name "github-actions[bot]"
         git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
-        git config pull.rebase false
+        git config --global pull.rebase true 
         git add .
         git commit -m "gitbot on `date`"
         git pull