makes deploy stage in pipeline fail if password wrong

fixes #4

.gitlab-ci.yml

@@ -19,7 +19,7 @@ deploy:
   script:
     - make
     - >-
-      curl
+      curl -f -v
       -u "$NEXTCLOUD_SHARE:$NEXTCLOUD_PW"
       -T title.pdf
       -H 'X-Requested-With: XMLHttpRequest'