wrong yamllint config

[mashehu]

Description of the bug

It looks like yamllint.yml is not recognized by the npm-version of yamllint (#1412 (comment)), which is the one the github action uses.

So, we either can use a different yaml-lint config or we switch to a different yamllint in the github action, e.g. this one seems to be based on the yamllint we wrote the yamllint.yml for (and have installed in the gitpod image) https://github.com/marketplace/actions/yamllint-github-action

Command used and terminal output

No response

System information

No response

[JoseEspinosa]

After some try and error, I think the best will be to switch to the GitHub action you proposed above, I will try to draft a PR as soon as I can

[ewels]

I think we've talked about using Prettier before to consolidate markdown and YAML into one tool. Maybe now would be a good time?

[mashehu]

I looked a bit into switching to prettier over the weekend. I think we should stick with markdown-lint and yaml-lint for now, because most of our markdown rules (e.g. ul-indent,no-duplicate-header, etc.) can not be replicated in a prettier config as far as I can see. But if you say these rules are not that important we could switch.

[JoseEspinosa]

Tried to fix this issue here #1422

[JoseEspinosa]

In the PR above, I switch to the github action proposed by @mashehu, might have lost some discussion since I could not connect last week.