Name artifacts to avoid a clash issue

Author: microbit-matt-hillsdon

.github/workflows/build.yml

@@ -20,6 +20,7 @@ jobs:
       - run: ./gradlew --no-daemon :app:assembleDebug
       - uses: actions/upload-artifact@v4
         with:
+          name: build
           path: ./app/build/outputs/apk/debug/*.apk
           retention-days: 3
   release:
@@ -46,6 +47,7 @@ jobs:
       # Temporary, for testing without tagging releases
       - uses: actions/upload-artifact@v4
         with:
+          name: release
           path: |
             ./app/build/outputs/apk/release/*.apk
             ./app/build/outputs/bundle/release/*.aab