Add rerun workflow

[jneira]

• to rerun other workflows via pr comments
• see https://github.com/marketplace/actions/rerun-actions

• rerun-actions should only be run on comment creation. See the below examples for how to do this.
• the PR either must have an ok-to-test label present on the PR, or the user who writes a command must be an organization member, or repo owner, contributor, or collaborator.

The action is triggered by adding a comment in the pr with

The following commands are supported by this action:
/rerun-all - rerun all failed workflows.
/rerun-workflow - rerun a specific failed workflow. Only one workflow name can be specified. Multiple /rerun-workflow commands are allowed per comment.

[pepeiborra]

Can you extend the description with an example usage?

[jneira]

Can you extend the description with an example usage?

Update the description with the available commands, you have to make a comment in the pr with the command