fix signed off check

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

Author: blizzz

.drone.yml

@@ -27,16 +27,15 @@ pipeline:
       - CORE_BRANCH=stable15
       - DB=sqlite
     commands:
-      - wget https://raw.githubusercontent.com/nextcloud/travis_ci/master/before_install.sh
-      - bash ./before_install.sh $APP_NAME $CORE_BRANCH $DB
-      - cd ../server
-      - php ./build/signed-off-checker.php
+      - wget https://raw.githubusercontent.com/nextcloud/server/stable15/build/signed-off-checker.php
+      - php ./signed-off-checker.php
     secrets: [ github_token ]
     when:
       matrix:
         include:
         - TESTS: syntax-php7.0
         - TESTS: signed-off-check
+
 matrix:
   include:
     - TESTS: signed-off-check