Handle github templates and initial configuration

[neilime]

• create a GH repo "template" (golden path/common) that contain all the possible commons things
• we want to setup the new repo from the template
• in the commons there as sync GH workflow (reusable) that will sync "template" to the child repo using (auto-?)merged PR

Ideas to include:

• test gatekeeper : https://github.com/upsidr/merge-gatekeeper
• codeql status check https://github.com/ewega/code-scanning-status-checker