Documented Docker container OpenSSL abilities being affected by Host network proxy services (#440)

* Documented Docker container OpenSSL abilities being affected by host
network proxy services, causing network certificates verification
problem during Docker container build stage of Grafana server setup.

Signed-off-by: Vladimir Stempen <vladimir.stempen@amd.com>

* Update docs/install/grafana-setup.rst

Co-authored-by: Peter Park <peter.park@amd.com>
Signed-off-by: vstempen <147086176+vstempen@users.noreply.github.com>

---------

Signed-off-by: Vladimir Stempen <vladimir.stempen@amd.com>
Signed-off-by: vstempen <147086176+vstempen@users.noreply.github.com>
Co-authored-by: Peter Park <peter.park@amd.com>

docs/install/grafana-setup.rst

@@ -79,6 +79,13 @@ directory to begin.
    $ sudo docker-compose build
    $ sudo docker-compose up -d
 
+.. note::
+
+   To troubleshoot Docker container build failures related to certificate verification, try 
+   disabling any network proxy services on the host system. These proxy services can interfere 
+   with OpenSSL's ability to retrieve a correct certificate chain when the container accesses 
+   external websites.
+
 The TCP ports for Grafana (``4000``) and MongoDB (``27017``) in the Docker
 container are mapped to ``14000`` and ``27018``, respectively, on the host side.