add mongo workflow

[Uzlopak]

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[Uzlopak]

Should we use mongo 6? Should we add parameters?

[climba03003]

Should we use mongo 6? Should we add parameters?

I would check both version.
But from my experience, server version shouldn't makes different since we check the connection only in @fastify/mongodb.

[Uzlopak]

There is no official mongo:6.0.0 docker image it seems like. So nevermind :)