Add LDAP options to .env.production.sample (#6592)

.env.production.sample

@@ -139,6 +139,16 @@ STREAMING_CLUSTER_NUM=1
 # UID=1000
 # GID=1000
 
+# LDAP authentication (optional)
+# LDAP_ENABLED=true
+# LDAP_HOST=localhost
+# LDAP_PORT=389
+# LDAP_METHOD=simple_tls
+# LDAP_BASE=
+# LDAP_BIND_DN=
+# LDAP_PASSWORD=
+# LDAP_UID=cn
+
 # PAM authentication (optional)
 # PAM authentication uses for the email generation the "email" pam variable
 # and optional as fallback PAM_DEFAULT_SUFFIX