GPG sec is text no need for base64, publish artifacts for tags

.gitlab-ci.yml

@@ -11,11 +11,12 @@ run tests in branches:
     - master
 
 publish artifacts:
-  stage:  compile
+  stage:  deploy
   image:  maven:3-jdk-8
   script:
-    - echo "${GPG_KEY_SECRET}" | base64 --decode | gpg --allow-secret-key-import --import
+    - echo "${GPG_KEY_SECRET}" | gpg --allow-secret-key-import --import
     - gpg --list-keys
     - mvn clean deploy --settings .ci-maven-settings.xml -B -U
   only:
     - master
+    - tags