Add section for downstreams in release guide

To avoid confusions clarify the expectations for downstreams regarding
the release worklflow and tools.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

content/guides/apertis_release_process.md

@@ -229,6 +229,13 @@ Similarly, for an Apertis Product Release of `v2019.0`, we add string `bv2019.0b
 
 # Appendix
 
+## Recommendations for downstream distributions
+
+Downstreams should use the same workflow and tools described in this section to automate and ensure a smooth release
+process. To do so they are encouraged to extend Apertis release scripts and CI to include their own repositories and
+other required delta. As in any other piece of software in the Apertis ecosystem it is recommended that downstreams
+propose new changes to these tools to make the release process smoother and more reliable.
+
 ## Helper scripts to ease Apertis development
 
 `release-scripts/`: contains helper scripts to ease release process.