Tolerations config need to be defined in values.yaml in digger-backend chart

[faustikle]

On charts/digger-backend/templates/backend-deployment.yaml you have this:

{{- if $.Values.digger.tolerations }}
  tolerations:
  {{- toYaml $.Values.digger.tolerations | nindent 8 }}
{{- end }}

But it was not defined in values.yaml, so we catch this error:

YAML parse error on digger-backend/templates/backend-deployment.yaml: error converting YAML to JSON: yaml: line 19: did not find expected key