Test PR on more platforms

Author: AlexanderWells-diamond

.github/workflows/code.yml

@@ -174,8 +174,15 @@ jobs:
   # Check that the master branches of various upstream dependencies are
   # still compatible when used together
   master_branch_test:
-    # if: ${{ github.event_name == 'schedule' }}
-    runs-on: "ubuntu-latest"
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-13]
+        python: [cp37, cp38, cp39, cp310, cp311, cp312]
+
+    name: build/${{ matrix.os }}/${{ matrix.python }}
+    runs-on: ${{ matrix.os }}
+
     steps:
       - name: Checkout Source
         uses: actions/checkout@v4
@@ -187,14 +194,11 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.12"
+          python-version: ${{ matrix.python }}
 
       - name: Install master versions
         run: |
-          pip install git+https://github.com/epics-base/p4p.git git+https://github.com/epics-base/pvxs.git
-          pip install git+https://github.com/epics-base/epicscorelibs.git@fix-compiler-detection
-          pip install git+https://github.com/DiamondLightSource/aioca git+https://github.com/DiamondLightSource/cothread
-          pip install -e .[dev]
+          pip install git+https://github.com/epics-base/epicscorelibs.git@fix-compiler-detection -e .[dev]
           pip freeze
 
       - name: Run tests