Don't build app when tag is pushed

Change-Id: I63737ff387b0074da9137c857a3e8f741201388b

Author: jacek-marchwicki

.gitlab-ci.yml

@@ -4,11 +4,13 @@ before_script:
 build-app:
   image: jacekmarchwicki/android
   script:
-  - python tools/download.py --token N0EhBUUHLRIRcC9ZuVjxRLZU --key-version agxzfmF1dG8tY2xvc2VyGAsSC1Byb2plY3RLZXlzGICAgICG7IcJDA
-  - ./gradlew --parallel --stacktrace build
-  - python tools/upload.py --token N0EhBUUHLRIRcC9ZuVjxRLZU --build-name "${CI_BUILD_REF_NAME}-${CI_BUILD_REF}" websockets-rxjava-example/build/outputs/ websockets-rxjava/build/docs/javadoc/ websockets-rxjava/build/libs/
+    - python tools/download.py --token N0EhBUUHLRIRcC9ZuVjxRLZU --key-version agxzfmF1dG8tY2xvc2VyGAsSC1Byb2plY3RLZXlzGICAgICG7IcJDA
+    - ./gradlew --parallel --stacktrace build
+    - python tools/upload.py --token N0EhBUUHLRIRcC9ZuVjxRLZU --build-name "${CI_BUILD_REF_NAME}-${CI_BUILD_REF}" websockets-rxjava-example/build/outputs/ websockets-rxjava/build/docs/javadoc/ websockets-rxjava/build/libs/
   tags:
-  - docker
+    - docker
+  except:
+    - tags
 
 build-server:
   image: python:2.7.10