[Elao - App - Docker] Add a make target to copy Github workflows

[ogizanagi]

Since we're not able to sync files out of the .manala directory on manala up and since it might not be expected to systematically update the Github workflows (i might be tweaked for the project specificities), we could perhaps imagine a make manala.workflows target that'll copy Github workflows from the .manala/github directory to the .github/workflows one, on-demand.
The the developer can simply check the diff and choose what to commit.

We may encounter some issues with the current structure:

• As of today, workflows' content is exposed in a README.md file, not inside a dedicated yaml file representing the workflow.
• We may have multiple workflows sampled in a single README.md. Some like release.yaml and deploy.yaml could be split. But some like integration workflows are dynamically generated (one per integration.github.jobs entry)

Is there a way to dynamically generate the workflows into dedicated files so we can simply copy them on-demand?