Create the following environment variables in your IDE launcher :
FR_LESPROJETSCAGNOTTES_SLACK_ENABLED=true
FR_LESPROJETSCAGNOTTES_SLACK_CATCHER_URL=http://localhost:3000
FR_LESPROJETSCAGNOTTES_SLACK_CLIENT_ID=<Slack Client ID>
FR_LESPROJETSCAGNOTTES_SLACK_CLIENT_SECRET=<Slack Client Secret>
Note: In these environment variables, use Slack Client ID and Slack Client Secret from Setup Slack#Install App to the workspace. The catcher URL corresponds to the Slack Events Catcher module