Upgrade usability of secrets

[purisev]

Dependent services will broke if you change default passwords in values.yaml
It can be improved by using the secret created in chart.

Also you need to allow using existed secret for pulling image.

[purisev]

I suggest to:

1. add in values.yaml:

registry:
  # Use already existing secret for pulling image
  useExistedSecret: false

defaultSecret:
  name: "allure-testops-secret"
  
redis:
  auth:
    # Use existing Secret
    existingSecret: "allure-testops-secret"
    
rabbitmq:
  auth:
    existingPasswordSecret: "allure-testops-secret"  

2. change in templates_helpers.tpl define of imagePullSecret to:

{{- define "imagePullSecret" }}
  {{- if not .Values.registry.useExistedSecret }}
  {{- with .Values.registry }}
    {{- printf "{\"auths\":{\"%s\":{\"username\":\"%s\",\"password\":\"%s\",\"auth\":\"%s\"}}}" .repo .auth.username .auth.password (printf "%s:%s" .auth.username .auth.password | b64enc) | b64enc }}
  {{- end }}
  {{- end }}
{{- end }}

3. change in templates\infra\secret.yaml:

metadata:
  name: {{ .Values.defaultSecret.name }}

4. and in templates\infra\secret.yaml:

  rabbitmq-erlang-cookie: {{ .Values.rabbitmq.auth.erlangCookie | b64enc | quote }}
  rabbitmq-password: {{ .Values.rabbitmq.auth.password | b64enc | quote }}
  redis-password: {{ .Values.redis.auth.password | b64enc | quote }}