Add timestamp to the signature

Otherwise jarsigner -verify complains about the lack of timestamp

war/pom.xml

@@ -564,6 +564,10 @@ THE SOFTWARE.
                 </goals>
                 <configuration>
                   <archive>${project.build.directory}/${project.build.finalName}.war</archive>
+                  <arguments>
+                    <argument>-tsa</argument>
+                    <argument>http://timestamp.comodoca.com/rfc3161</argument>
+                  </arguments>
                 </configuration>
               </execution>
             </executions>