Automated deploys via workflows

[brauliorivas]

BEGINRELEASENOTES

• This PR is related to Preview from PRs #14.
• Here I've added 3 possible workflows that can be used to deploy dmX.
• All deploys will be hosted with GitHub Pages under a special branch called gh-pages. (dmX should be configured to be deployed under this branch)

This works as follows:

1. static.yml: This will be used to deploy a stable version of dmX to GitHub Pages.
2. preview.yml: Workflow to deploy dmX versions from PR's. That means that when opening, closing, etc, a PR, will be created a GitHub Page with that version in order to visualize the changes.
3. development.yml: Workflow that would work with a hypothetic beta branch to deploy early/testing versions of dmX.

These workflows can also be used for #15, where some testing should run on merges/pr's.
ENDRELEASENOTES

[brauliorivas]

Now, the required workflows are done. After merging this, dmX repo should be configured to be deployed using GitHub Pages from a source branch. In this case: gh-pages. This process is explained in GitHub documentation here
Then, a following pull request will be opened to create an index.html file, in order to configure some redirects, as explained in here.

[brauliorivas]

Also, I think we should configure when to run the workflows. Commonly, first-time contributors should request workflows to be run by repo owners. More about this here

[tmadlener]

https://github.com/key4hep/dmx/pull/16/checks#step:3:164

Is this authentication error because your tokens don't have enough rights?

[brauliorivas]

Is this authentication error because your tokens don't have enough rights?

I would think so. I think that these workflows would run successfully only if these changes are merged. Until then, they would fail. However, I'll check more about this.

[brauliorivas]

Is this authentication error because your tokens don't have enough rights?

After checking out some documentation, I think that for this workflow to work, we need to activate read and write permissions as explained here

[tmadlener]

I will merge this. As far as I can see all the permissions should be OK and I would like to see if this is related to not having this in the repo yet.

[tmadlener]

So the preview didn't get fixed, I think (at least not for your PRs)