add mvn build sources

ozgcloud-common-parent/pom.xml

@@ -373,6 +373,19 @@
 					</execution>
 				</executions>
 			</plugin>
+
+			<plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-source-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>attach-sources</id>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
 		</plugins>
 	</build>