Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -4,5 +4,13 @@ variables:
 
 build:
     script:
-        - echo $JAVA_HOME
-        - mvn package -B
+        - mvn package -B
+        
\ No newline at end of file
+release:
+    script:
+        - "echo create release"
+    only:
+        - tags
+        refs:
+            - master
+        
\ No newline at end of file