Autogenerate Minio and Postgres passwords

[jesper7]

Like we do for SECRET_KEY, we should also autogenerate Minio and Postgres passwords unless provided in values.yaml

helm-charts/charts/studio/templates/secrets.yaml

Lines 43 to 51 in c828a33

	# Set secretKey to existing value or generate a random one
	{{- if .Values.global.secrets.secretKey }}
	secretKey: {{ .Values.global.secrets.secretKey | b64enc }}
	{{- else }}
	{{- $secretObj := (lookup "v1" "Secret" .Release.Namespace "studio") | default dict }}
	{{- $secretData := (get $secretObj "data") | default dict }}
	{{- $secretKey := (get $secretData "secretKey") | default (randAscii 40 | b64enc) }}
	secretKey: {{ $secretKey | quote }}
	{{- end }}