Send init message to slack on startup

[dtuite]

• [x] Send init message to Slack on startup.
• [x] Send message to Google Hangouts Chat on startup. Ensure the table renders correctly.
• [x] Send webhooks on Startup.
• [x] Start using json omitempty
• [x] Try using the native Helm methods for getting secrets.
  • [x] Ensure the init message is sent even if there are no helm charts installed.
  • [ ] Release a new version