Open Collective Bot configuration

[open-collective-bot]

Thank your for installing the Open Collective Bot!

To activate and configure it, please review and merge this PR.

[dnfadmin]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

❌ open-collective-bot[bot] sign now
_{You have signed the CLA already but the status is still pending? Let us recheck it.}