ci: pull again before pushing

Sometimes, there are untracked files left in the dl directory, which
another job already commited in the DL cache. git pull will then fail
becaue it won't overwrite untracked files.

By first pulling (which will fail), then commiting and pulling again we
will avoid this situation.

.gitlab-ci.yml

@@ -33,8 +33,9 @@ default:
     - git config --global user.name "FFS Buildbot"
     - mkdir -p ~/.ssh
     - cat gitlab-known-hosts >> ~/.ssh/known_hosts
-    - cd gluon/openwrt/dl && git pull && git add . && git commit -m "update DL cache" || true
-    - git push || true
+    - cd gluon/openwrt/dl && git pull 
+    - git add . && git commit -m "update DL cache" || true
+    - git pull && git push || true
 
 generate_date:
   stage: generate_date