Fix artifact name

Author: jericks

.github/workflows/build.yml

@@ -18,5 +18,5 @@ jobs:
       - name: Upload geoscript-py-app.jar
         uses: actions/upload-artifact@v2
         with:
-          name: geoscript-py-app
+          name: geoscript-py-app.jar
           path: target/geoscript-py-app-*.jar