Enable Docker section in the release notes

cumulus/scripts/ci/changelog/templates/docker_image.md.tera

@@ -1,11 +1,11 @@
-<!--
+
 ## Docker images
 
 The docker image for this release can be found in [Docker hub](https://hub.docker.com/r/parity/polkadot-parachain/tags?page=1&ordering=last_updated).
+(It will be available a few minutes after the release has been published).
 
 You may also pull it with:
 
 ```
 docker pull parity/polkadot-parachain:latest
 ```
--->

cumulus/scripts/ci/changelog/templates/template.md.tera

@@ -32,4 +32,7 @@ This release contains the changes from `{{ env.REF1 }}` to `{{ env.REF2 }}`.
 {% endif %}
 
 {% include "changes.md.tera" -%}
+
+{% if env.RELEASE_TYPE and env.RELEASE_TYPE == "client" -%}
 {% include "docker_image.md.tera" -%}
+{% endif %}