Add note to env-template file

Author: nmorenor

compose/.env-template

@@ -39,6 +39,9 @@ COLLAB_FQDN=collab.example.com
 INTEL_FQDN=intel.example.com
 INTEL_SECRET=super-secret-string
 
+# SSL cerfificate files should be placed in the `nginx/ssl` directory.
+# Ensure these files are present and correctly named.
+# Should be valid SSL certificates for the respective FQDNs.
 SSL_COLLAB_CERT=ssl-collab.crt
 SSL_COLLAB_KEY=ssl-collab.key