improved proxy support

roles/kubernetes-apps/helm/templates/helm-container.j2

@@ -6,6 +6,11 @@
   -v {{ helm_home_dir }}:{{ helm_home_dir }}:rw \
   {% for dir in ssl_ca_dirs -%}
   -v {{ dir }}:{{ dir }}:ro \
-  {% endfor -%}
+  {% endfor -%} 
+  {% if proxy_env is defined -%}
+  -e http_proxy="{{proxy_env.http_proxy}}" \
+  -e https_proxy="{{proxy_env.https_proxy}}" \
+  -e no_proxy="{{proxy_env.no_proxy}}" \
+  {% endif -%}
   {{ helm_image_repo }}:{{ helm_image_tag}} \
   "$@"