pipeline.yaml: Add all stable trees

Add all stable-rc trees for testing.

Signed-off-by: Denys Fedoryshchenko <[email protected]>

Author: nuclearcat

config/pipeline.yaml

@@ -476,7 +476,31 @@ build_configs:
     branch: 'master'
     variants: *build-variants
 
-  stable-rc_6.6:
+  stable-rc_4.19: &stable-rc
     tree: stable-rc
-    branch: 'linux-6.6.y'
+    branch: 'linux-4.19.y'
     variants: *build-variants
+
+  stable-rc_5.4:
+    <<: *stable-rc
+    branch: 'linux-5.4.y'
+
+  stable-rc_5.10:
+    <<: *stable-rc
+    branch: 'linux-5.10.y'
+
+  stable-rc_5.15:
+    <<: *stable-rc
+    branch: 'linux-5.15.y'
+
+  stable-rc_6.1:
+    <<: *stable-rc
+    branch: 'linux-6.1.y'
+
+  stable-rc_6.6:
+    <<: *stable-rc
+    branch: 'linux-6.6.y'
+
+  stable-rc_6.7:
+    <<: *stable-rc
+    branch: 'linux-6.7.y'