Improve jjb for pti rtp project

Refactor merge job to offload the image building process
to a new release job which will be triggered once or twice
per release. This helps save resources of ci infrastructure

Issue-ID: INF-15
Signed-off-by: Bin Yang <bin.yang@windriver.com>
Change-Id: I23ed988e06451622d9f144e5f4a1380c3eff86ee
diff --git a/jjb/pti-rtp/pti-rtp.yaml b/jjb/pti-rtp/pti-rtp.yaml
index f4ed03e..e19d2dd 100644
--- a/jjb/pti-rtp/pti-rtp.yaml
+++ b/jjb/pti-rtp/pti-rtp.yaml
@@ -41,6 +41,17 @@
 - project:
     <<: *pti_rtp_common
     name: pti-rtp-merge
+    # runs about 40 minutes
+    build-timeout: 60
+    script: !include-raw-escape:
+        - install-yocto-prereq-centos.sh
+        - verify-yocto.sh
+    jobs:
+      - oran-shell-merge
+
+- project:
+    <<: *pti_rtp_common
+    name: pti-rtp-release-merge
     # demand 200GB storage
     build-node: centos7-docker-2c-8g-200g
     # runs about 18 hours
@@ -50,4 +61,4 @@
         - build-yocto.sh
         - upload-yocto.sh
     jobs:
-      - oran-shell-merge
+      - oran-shell-release