pg-db chart does not support tolerations as list

[networkhermit]

chart version: 2.3.18

There are multiple examples that demonstrate the usage of tolerations in the values file:

percona-helm-charts/charts/pg-db/values.yaml

Lines 118 to 122 in 4d24385

	# tolerations:
	# - effect: NoSchedule
	# key: role
	# operator: Equal
	# value: connection-poolers

But the helm template does not support them well, passing a tolerations list when installing a helm release would fail:

percona-helm-charts/charts/pg-db/templates/cluster.yaml

Lines 169 to 175 in 4d24385

	{{- if $instance.tolerations }}
	tolerations:
	- effect: {{ $instance.tolerations.effect }}
	key: {{ $instance.tolerations.key }}
	operator: {{ $instance.tolerations.operator }}
	value: {{ $instance.tolerations.value }}
	{{- end }}

Current workaround is passing a single tolerations map:

  tolerations: 
    effect: NoSchedule 
    key: role 
    operator: Equal 
    value: connection-poolers