ci: Add dependabot

[ccoVeille]

No description provided.

[raeperd]

referenced: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
lgtm

edit: fixed link

[ccoVeille]

The link is broken, I assume it's

https://docs.github.com/en/code-security/dependabot/dependabot-alerts/configuring-notifications-for-dependabot-alerts

[ccoVeille]

why did you remove this part ?

    open-pull-requests-limit: 10 # avoid spam, if no one reacts

[raeperd]

Default value of open-pull-requests-limit is 5, which is kinda reasonable to me for most projects.
And also, this project starts without any dependency so 5 is kinda enough maybe.

https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#open-pull-requests-limit

[ccoVeille]

Oh good catch, I wrongly assumed, there were no limit when none was provided.

I should have read the documentation

[ccoVeille]

So I'm fine with the PR