Add step to upload Plugin jar in workflow

Author: Galaxy202

.github/workflows/maven.yml

@@ -33,3 +33,8 @@ jobs:
     # Optional: Uploads the full dependency graph to GitHub to improve the quality of Dependabot alerts this repository can receive
     - name: Update dependency graph
       uses: advanced-security/maven-dependency-submission-action@571e99aab1055c2e71a1e2309b9691de18d6b7d6
+    - name: Upload Plugin jar
+      uses: actions/upload-artifact@v4
+      with:
+        name: Plugin-${{ env.snapshotVersion }}-${{ env.git_hash }}.jar
+        path: ${{ env.artifactPath }}/Plugin-${{ env.snapshotVersion }}.jar