Create a Github Workflow to convert markdown changelog files into Lua changelog files

[Garanas]

Description

Needs: https://github.com/FAForever/fa/issues/6237

Create a new workflow file to convert the changelog files from the markdown format to a Lua format. This workflow should use the tool created in https://github.com/FAForever/fa/issues/6237 . The output of the workflow is an artifact with all the changelog files in a Lua format.