workflow updates

Author: jcarbaugh

.github/workflows/pythonpackage.yml

@@ -1,8 +1,11 @@
 name: Python package
 
 on:
-  push:
   workflow_dispatch:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
 
 jobs:
   build:
@@ -17,6 +20,8 @@ jobs:
     - uses: actions/checkout@v6
     - name: Install uv
       uses: "astral-sh/setup-uv@v8.0.0"
+      with:
+        cache-suffix: ${{ matrix.python-version }}
     - name: Set up Python ${{ matrix.python-version }}
       run: uv python install ${{ matrix.python-version }}
     - name: Install dependencies