doc: Add EclipseMirror information to RELEASING.md (#3365)

* doc: Add EclipseMirror information to RELEASING.md

Signed-off-by: Stewart X Addison <sxa@redhat.com>

* Updates following review

Signed-off-by: Stewart X Addison <sxa@redhat.com>

* Add :

Signed-off-by: Stewart X Addison <sxa@redhat.com>

---------

Signed-off-by: Stewart X Addison <sxa@redhat.com>

RELEASING.md

@@ -315,11 +315,12 @@ Once the PRs to change those files have been merged, the [adoptium-packages-linu
 
 4. **[Docker Hub]** The information on updating the Adoptium official dockerhub repository is at <https://github.com/adoptium/containers#maintenance-of-dockerfiles> at the moment you cannot do this until all Linux architectures and windows64 are published for the appropriate version
 
-5. Publicise the Temurin release
+5. Once everything has been published to GitHub, use the [EclipseMirror](https://ci.eclipse.org/temurin-compliance/job/EclipseMirror/) job to mirror the artifacts to our Eclipse server for backup purposes. Note that this will need to be done by a team member in the temurin-compliance project (Run once for each of the releases)
+
+6. Publicise the Temurin release:
 
 - Via slack on the Adoptium #release channel
 - Find someone with the appropriate authority (Carmen, George, Martijn, Shelley, Stewart, Tim) to post a tweet about the new release from the Adoptium twitter account
-- Also run the EclipseMirror job in the Eclipse jenkins instance to create a backup of the release from GitHub onto the Eclipse servers.
 
 ### Post Release Tasks