feat(ci): Trigger regeneration of community docs on release

[wdullaer]

Description

Triggers a rebuild of the community docs when we release a new CLI version.

Checklist

(For exoscale contributors)

• Changelog updated (under Unreleased block)
• Testing

Testing

GH_TOKEN was set the value in the secret.

$ export GH_TOKEN=<redacted>
$ gh workflow run gen-cli.yaml -R exoscale/community-ng -f version=master
✓ Created workflow_dispatch event for gen-cli.yaml at main

To see runs for this workflow, try: gh run list --workflow=gen-cli.yaml