Minor modifications for GitLab-CI

.gitlab-ci.yml

@@ -17,6 +17,7 @@ cache:
 build:
   stage: build
   script:
+    - rm -rf .m2/repository
     - mvn $MAVEN_CLI_OPTS clean compile
 
 test:
@@ -65,5 +66,6 @@ deploy:
         mv *.deb ../target
         
         ~/push_deb_packages.sh ../target
-        
-      fi
\ No newline at end of file
+      fi
+  only:
+    - master
\ No newline at end of file