test: gz-physics9 with prerelease

Author: scpeters

plugins/config/repository.yaml

@@ -41,6 +41,13 @@ repositories:
 # wildcards are allowed in name, entries are processed in top-down order
 # first entry matching the name is used
 projects:
+    # test gz-physics9 with prerelease (DONT MERGE)
+    - name: gz-physics9
+      repositories:
+          - name: osrf
+            type: stable
+          - name: osrf
+            type: prerelease
     # Use nightlies in all main branches
     - name: gz-tools3
       repositories:
@@ -65,4 +72,4 @@ projects:
     - name: sdformat.*
       repositories:
           - name: osrf
-            type: stable
+            type: stable