markdown source builds

Auto-generated via `{sandpaper}`
Source  : b96d794
Branch  : main
Author  : Dimitrios Theodorakis <[email protected]>
Time    : 2024-12-03 18:07:02 +0000
Message : MetOffice#25 Adds in a CONTRIBUTING.md file to the git-training-demo zip file

Author: actions-user