FEATURE: Option to connect to Redis using SSL

app/models/global_setting.rb

@@ -172,6 +172,7 @@ class GlobalSetting
         c[:db] = redis_db if redis_db != 0
         c[:db] = 1 if Rails.env == "test"
         c[:id] = nil if redis_skip_client_commands
+        c[:ssl] = true if redis_use_ssl
 
         c.freeze
       end
@@ -195,6 +196,7 @@ class GlobalSetting
         c[:db] = message_bus_redis_db if message_bus_redis_db != 0
         c[:db] = 1 if Rails.env == "test"
         c[:id] = nil if message_bus_redis_skip_client_commands
+        c[:ssl] = true if redis_use_ssl
 
         c.freeze
       end

config/discourse_defaults.conf

@@ -120,6 +120,9 @@ redis_password =
 # skip configuring client id for cloud providers who support no client commands
 redis_skip_client_commands = false
 
+# uses SSL for all Redis connections if true
+redis_use_ssl = false
+
 # message bus redis server switch
 message_bus_redis_enabled = false