ceph-grafana: Add proxy env vars to grafana service template

When installing grafana plugins, the container will make http requests.
This requires http proxy otherwise installation cannot be performed. Passed
the proxy vars from all.yml as env args.
Fixes: #6484, #6481

Signed-off-by: John Karasev <john.karasev@intel.com>
(cherry picked from commit 79ca442)

roles/ceph-grafana/templates/grafana-server.service.j2

@@ -32,6 +32,15 @@ ExecStart=/usr/bin/{{ container_binary }} run --rm --name=grafana-server \
   --memory={{ grafana_container_memory }}GB \
   --memory-swap={{ grafana_container_memory * 2 }}GB \
   -e GF_INSTALL_PLUGINS={{ grafana_plugins|join(',') }} \
+{% if ceph_docker_http_proxy is defined %}
+  -e http_proxy={{ ceph_docker_http_proxy }} \
+{% endif %}
+{% if ceph_docker_https_proxy is defined %}
+  -e https_proxy={{ ceph_docker_https_proxy }} \
+{% endif %}
+{% if ceph_docker_no_proxy is defined %}
+  -e no_proxy={{ ceph_docker_no_proxy }} \
+{% endif %}
   {{ grafana_container_image }}
 {% if container_binary == 'podman' %}
 ExecStop=-/usr/bin/sh -c "/usr/bin/{{ container_binary }} rm -f `cat /%t/%n-cid`"