further CI wf improvements

Author: tzolov

.github/workflows/continuous-integration.yml

@@ -18,6 +18,11 @@ jobs:
           java-version: '17'
           distribution: 'temurin'
           cache: 'maven'
+          server-id: ossrh
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_PASSWORD
+          gpg-private-key: ${{ secrets.GPG_SECRET_KEY }}
+          gpg-passphrase: MAVEN_GPG_PASSPHRASE
 
       - name: Setup Node.js
         uses: actions/setup-node@v4