fix(charts): pipeline time_zone value to quote func

Author: mboersma

charts/controller/templates/controller-deployment.yaml

@@ -76,7 +76,7 @@ spec:
             - name: "IMAGE_PULL_POLICY"
               value: "{{ .Values.app_pull_policy }}"
             - name: "TZ"
-              value: "{{ default 'UTC' .Values.time_zone }}"
+              value: {{ .Values.time_zone | default "UTC" | quote }}
 {{- if (.Values.deploy_hook_urls) }}
             - name: DEIS_DEPLOY_HOOK_URLS
               value: "{{ .Values.deploy_hook_urls }}"