Release solum RC1 for 2023.2 Bobcat

This proposed a RC1 release for solum to get any merged changes
out prior to the RC1 deadline for 2023.2 Bobcat 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 15.

Change-Id: I12e882bde4d64a02f24bda85f42ec8a3a332fff3
Signed-off-by: Elod Illes <elod.illes@est.tech>

deliverables/bobcat/solum.yaml

@@ -5,3 +5,11 @@ team: solum
 type: service
 repository-settings:
   openstack/solum: {}
+releases:
+  - version: 15.0.0.0rc1
+    projects:
+      - repo: openstack/solum
+        hash: 42575ef1316983e4d48b89ecf9d8a71e899f18db
+branches:
+  - name: stable/2023.2
+    location: 15.0.0.0rc1