Put gpg config in docker site

Author: akurtakov

releng/org.eclipse.linuxtools.docker-site/pom.xml

@@ -63,6 +63,18 @@
 					<plugin>
 						<groupId>org.eclipse.tycho</groupId>
 						<artifactId>tycho-gpg-plugin</artifactId>
+						<executions>
+							<execution>
+								<id>pgpsigner</id>
+								<goals>
+									<goal>sign-p2-artifacts</goal>
+								</goals>
+								<configuration>
+									<keyname>F5CBCFD82F07D82E</keyname>
+									<skipIfJarsigned>false</skipIfJarsigned>
+								</configuration>
+							</execution>
+						</executions>
 					</plugin>
 				</plugins>
 			</build>