https://pagure.io/fedora-infrastructure/issue/12057

1. Describe what you would like us to do:

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In https://pagure.io/fedora-infrastructure/issue/11734 we got a maubot intance created to monitor pipeline failues on bodhi.
This have been working well, but I would like to enable markdown formatting to get more visual information in the messages posted.
Right now I think the formatting is set to `plaintext`.

I am referring to [this setting](https://github.com/fedora-infra/maubot-webhook?tab=readme-ov-file#message_format)

1. When do you need this to be done by? (YYYY/MM/DD)

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Not urgent