Release mistral-dashboard RC1 for Zed

This proposed a RC1 release for mistral-dashboard to get any merged changes
out prior to the RC1 deadline for Zed going into effect.

If the team is ready to proceed, please leave a +1 to acknowledge this
release and we will process right away. If the team is working on any
final merges, leave a -1 with some detail on the status and update the
patch with the new commit hash to use when ready.

Patches with no response will be merged by early Friday, September 16.

Signed-off-by: Elod Illes <elod.illes@est.tech>
Change-Id: I27db3bb7ad17ce21fb37bf38f35dacf6bd290afb

deliverables/zed/mistral-dashboard.yaml

@@ -6,3 +6,11 @@ team: mistral
 type: horizon-plugin
 repository-settings:
   openstack/mistral-dashboard: {}
+releases:
+  - version: 15.0.0.0rc1
+    projects:
+      - repo: openstack/mistral-dashboard
+        hash: 43903b7f3cd0fb7fe04da88517148539e865b9fc
+branches:
+  - name: stable/zed
+    location: 15.0.0.0rc1