Separate artefacts per-strategy

Author: toroidal-code

.github/workflows/test.yml

@@ -48,7 +48,7 @@ jobs:
       uses: actions/upload-artifact@v4
       if: always()
       with:
-        name: Test Results
+        name: Test Results (${{ matrix.os }} - ${{ matrix.compiler }})
         path: build/spec/results/*.xml
 
   publish-test-results: