test github actions

Author: kywch

.github/workflows/install.yml

@@ -43,5 +43,13 @@ jobs:
       - name: Upgrade pip
         run: python -m pip install -U pip
 
+      - name: Install PyTorch CPU
+        if: matrix.env == 'conda'
+        run: conda install pytorch cpuonly -c pytorch
+      
+      - name: Install PyTorch CPU  
+        if: matrix.env == 'pip'
+        run: pip install torch --index-url https://download.pytorch.org/whl/cpu
+      
       - name: Install pufferlib
-        run: pip install -e .
+        run: pip install -e . --no-build-isolation