feat(helm): deploy Grafana dashboard

[apricote]

We should make it possible to automatically deploy the Grafana dashboard through the Helm Chart. The Grafana Helm Chart includes a sidecar that watches ConfigMaps with the grafana_dashboard: 1 label and imports them into the Grafana instance.

1. Add new keys to chart/values.yaml:

   metrics:
     dashboard:
       # If enabled, deploy a ConfigMap with our Grafana dashboard.
       enabled: false
       labels:
         grafana_dashboard: 1

2. Add a new file chart/templates/core/grafana-dashboard.yaml that renders the ConfigMap with the dashboard as a data field if metrics.dashboard.enabled==true. Check if we can potentially symlink the dashboard from its current configuration or we need to create a copy.

Pointers:

• https://github.com/grafana/helm-charts/tree/main/charts/grafana#sidecar-for-dashboards
• https://helm.sh/docs/chart_template_guide/accessing_files/#configmap-and-secrets-utility-functions

[github-actions]

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