Add Tugboat support for Live Previews

Tugboat Previews are now created for MRs.

Improved the Tugboat experience for MRs adding these changes:

• Install Umami profile instead of Standard
• Create 3 simple dashboards for the different roles (administrator, editor & author) with different blocks
• Allow admin to access all the dashboards, editors and authors can only access to their specific dashboard
• Created dummy users editor/editor author/author besides the admin one

Hope it provides a better experience for testing MRs.

Feel free to add any suggestion if you miss any essential feature.

LGTM

penyaskito → credited ckrina → .

Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.