fix multiple entries in script deploy [travis-ci/travis-ci#7641]

.travis.yml

@@ -28,12 +28,7 @@ jobs:
     deploy:
       provider: script
       skip_cleanup: true
-      script:
-        - cp dockerfiles/filebrowser Dockerfile
-        - docker build -t filebrowser/filebrowser .
-        - ./build/docker_login.sh
-        - docker push filebrowser/filebrowser
-        - docker logout
+      script: ./build/build_img.sh && ./build/docker_login.sh && docker push filebrowser/filebrowser && docker logout
       on:
         tags: false
         repo: filebrowser/filebrowser