docs: add how to set database.default.encrypt with .env

Author: kenjis

user_guide_src/source/database/configuration.rst

@@ -104,8 +104,19 @@ default group's configuration settings. The values should be name following this
     database.default.password = '';
     database.default.database = 'ci4';
 
-.. important:: You cannot add a new property by setting environment variables,
-    nor change a scalar value to an array. See :ref:`env-var-replacements-for-data`.
+But you cannot add a new property by setting environment variables, nor change a
+scalar value to an array. See :ref:`env-var-replacements-for-data` for details.
+
+So if you want to use SSL with MySQL, you need a hack. For example, set the array
+values as a JSON string in your **.env** file:
+
+::
+
+    database.default.encrypt = {"ssl_verify":true,"ssl_ca":"/var/www/html/BaltimoreCyberTrustRoot.crt.pem"}
+
+and decode it in the constructor in the Config class:
+
+.. literalinclude:: configuration/009.php
 
 **********************
 Explanation of Values:

user_guide_src/source/database/configuration/009.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Config;
+
+use CodeIgniter\Database\Config;
+
+/**
+ * Database Configuration
+ */
+class Database extends Config
+{
+    // ...
+
+    public function __construct()
+    {
+        // ...
+
+        $array = json_decode($this->default['encrypt'], true);
+        if (is_array($array)) {
+            $this->default['encrypt'] = $array;
+        }
+    }
+}