A Release-Notes-Text should be rendered above the table with the changes. Using a 'dummy action' (I call it dummy as it is no action directly related to an issue or code-change but a ontainer for 'anything that has to do with this release') the text would be rendered as a table row and is therefore not popular enough. Additionally this would semantically be incorrect as an action is defined as 'A single action done on the project, during this release' and is not suitable for something the deployer has to keep in mind.
I would like to have a report like
Be careful to run the migrationJob xyz after installing it!
An Update of the admins profile data is needed for this release. So ....
||invent a new look and feel
||Download of xyz is not possible
I hope it is clear now.