The problem was the Data Explorer actual version (main branch) which is not compatible with Discourse 2.8.8 ; I have tried for both standard install and Bitnami install.
Finally, I found a solution to install the plugins on Discourse Bitnami:
cd /opt/bitnami/discourse
sudo RAILS_ENV=production bundle exec rake plugin:install repo=PLUGIN_REPO_URL
...
RAILS_ENV=production LOAD_PLUGINS=0 bundle exec rake plugin:pull_compatible_all
RAILS_ENV=production bundle exec rake db:migrate
RAILS_ENV=production bundle exec rake themes:update assets:precompile
The last 3 commands are necessary to:
- Check for plugins compatibility with installed Discourse’s version and pull the last compatible version for each specified plugin
- Execute database migrations if there are some plugins that require it
- Update themes and compile assets