Attach Maven sources

Author: Andrzej Swatowski

pom.xml

@@ -449,6 +449,15 @@ under the License.
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-source-plugin</artifactId>
+            <version>3.2.0</version>
+            <executions>
+              <execution>
+                <id>attach-sources</id>
+                <goals>
+                  <goal>jar-no-fork</goal>
+                </goals>
+              </execution>
+            </executions>
           </plugin>
 
           <plugin>