update build workflow

.github/workflows/build.yml

@@ -14,9 +14,13 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
+      - uses: actions/checkout@v4
       - name: build
         run: |
-          git clone https://github.com/North-Western-Development/oc2r.git -b 1.20.1
-          cd oc2r
           wget https://github.com/North-Western-Development/sedna-mc/releases/download/1.18.2-forge%2F1.0.46/sedna-1.18.2-forge-1.0.46+3176c2b.jar -O libs/sedna.jar
           ./gradlew build
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: sedna.jar
+          path: build/libs/*.jar