Grafana setup

[bgatellier]

Closes #191

Changelog

• Move the Docker images environment variables into dedicated env files (mysql, dbgate, grafana)
• Add an healthcheck for the MySQL container
• Grafana:
  • Add the MySQL datasource
  • Add the GreenIT dashboard
  • Add the Lighthouse dashboard

[changeset-bot]

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Latest commit: 5ecba00

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