MTA-3295: [Github] Security issue that Php files are executable

- Fixes #4162

Author: lanken

dev/tests/functional/etc/config.xml.dist

@@ -13,6 +13,12 @@
         <appBackendUrl>http://magento2ce.com/admin/</appBackendUrl>
         <backendLoginUrl>admin/auth/login</backendLoginUrl>
     </application>
+    <isolation>
+        <resetUrlPath>dev/tests/functional/isolation.php</resetUrlPath>
+        <testSuite>none</testSuite>
+        <testCase>none</testCase>
+        <test>none</test>
+    </isolation>
     <install>
         <host>127.0.0.1</host>
         <user>root</user>