Update artifacts naming and build command

Author: stariy95

.github/workflows/release-prepare.yml

@@ -35,13 +35,13 @@ jobs:
         env:
           SETUPTOOLS_SCM_PRETEND_VERSION_FOR_jjava: ${{ github.ref_name }}
         run: |
-          mvn clean verify -U
+          mvn clean package -DskipTests -U
           python -m build
 
       - name: Collect the release distributions
         run: |
           mkdir -p release/
-          cp jjava/target/jjava-${{ github.ref_name }}-kernelspec.zip release/
+          cp jjava-distro/target/jjava-${{ github.ref_name }}-kernelspec.zip release/
           cp -r dist/* release/
 
       - name: Store the release distributions