Sync a private repository to a fork repository (used by Spicytrip)

sync-fork.git

I forked the repo to my own account and then cloned it to my PC
git clone https://github.com/bartwttewaall/spicytrip-web.git

Then I added a new upstream repository as specified in this article with the original repository url from wirelab
git remote add upstream https://github.com/wirelab/spicytrip-web.git

I then double checked the remotes with
git remote -v
and I now see both 2 origin and 2 upstream remotes.

I fetch all new commits and other information from the new upstream repo:
git fetch upstream

Then I make sure I'm in my own master branch (of the fork) and merge with the upstream:
git merge upstream/master

No merge issues should arise since I didn't work in the fork. So I can just push it in my fork:
git push