Thanks to @witek, who updated https://github.com/collective/training-sandbox with the version pins necessary to fix the “Deploy to Heroku” button on https://plone.org/download
It’s now (once again) super easy to try the latest Plone version on a free Heroku account.
Hmm… the Mosaic that it ships with needs an upgrade.
Code of Conduct –
Hosting courtesy of Rackspace