Add changelog entry for JTL Docker tests (#2953)

Author: vy

src/changelog/.2.x.x/2953_enable_docker_for_JTL.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns="https://logging.apache.org/xml/ns"
+       xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
+       type="changed">
+  <issue id="2953" link="https://github.com/apache/logging-log4j2/pull/2953"/>
+  <description format="asciidoc">Enable Docker-based tests in CI for JSON Template Layout</description>
+</entry>