[Ex CI] Added PipelineRepoRef var (#313)

Author: amd-hsivasun

.azuredevops/rocm-ci.yml

@@ -1,13 +1,19 @@
+variables:
+- group: common
+- template: /.azuredevops/variables-global.yml@pipelines_repo
+
+parameters:
+- name: pipelinesRepoRef
+  type: string
+  default: refs/heads/develop
+
 resources:
   repositories:
   - repository: pipelines_repo
     type: github
     endpoint: ROCm
     name: ROCm/ROCm
-
-variables:
-- group: common
-- template: /.azuredevops/variables-global.yml@pipelines_repo
+    ref: ${{ parameters.pipelinesRepoRef }}
 
 trigger:
   batch: true