Update phpunit.xml.dist

Signed-off-by: Simon Mundy <46739456+simon-mundy@users.noreply.github.com>

Author: simon-mundy

phpunit.xml.dist

@@ -27,11 +27,11 @@
         </include>
     </source>
     <php>
-        <env name="TESTS_PHPDB_ADAPTER_MYSQL" value="false"/>
+        <env name="TESTS_PHPDB_ADAPTER_MYSQL" value="true"/>
         <env name="TESTS_PHPDB_ADAPTER_MYSQL_HOSTNAME" value="mysql"/>
         <env name="TESTS_PHPDB_ADAPTER_MYSQL_USERNAME" value="root"/>
         <env name="TESTS_PHPDB_ADAPTER_MYSQL_PASSWORD" value=""/>
         <env name="TESTS_PHPDB_ADAPTER_MYSQL_DATABASE" value="phpdb_test"/>
         <env name="TESTS_PHPDB_ADAPTER_MYSQL_PORT" value="3306"/>
     </php>
-</phpunit>
+</phpunit>