Add Maven publish step to Jenkins pipeline

Jenkinsfile

@@ -6,6 +6,11 @@ pipeline {
                 sh './gradlew build -PalttdSnapshotUsername=$NEXUS_CREDS_USR -PalttdSnapshotPassword=$NEXUS_CREDS_PSW'
             }
         }
+        stage('Publish to Maven') {
+            steps {
+                sh './gradlew publish -PalttdSnapshotUsername=$NEXUS_CREDS_USR -PalttdSnapshotPassword=$NEXUS_CREDS_PSW'
+            }
+        }
         stage('Archive') {
             steps {
                 archiveArtifacts artifacts: 'build/libs/', followSymlinks: false