Update build command.

Also ensure that we can install (and build, since that's how the action is configured) on 3.8 through 3.12.

.github/workflows/framework-tests.yaml

@@ -93,20 +93,27 @@ jobs:
           PEBBLE: /tmp/pebble
 
   pip-install:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python 3
         uses: actions/setup-python@v2
         with:
-          python-version: '3.11'
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install build dependencies
+        run: pip install wheel build
 
       - name: Build
-        run: python setup.py sdist
+        run: python -m build
 
       # Test that a pip install of the source dist .tar.gz will work
       - name: Test 'pip install'
         # Shouldn't happen, but pip install will fail if ls returns multiple lines
         run: pip install $(ls dist/ops*.gz)
-