Native build job fix (#197)

Summary: Native build job fix
Type: Fix
Test Plan: CI
Jira: ENTDAI-2475

Author: skywojciechowskim

.github/workflows/native_build.yml

@@ -55,12 +55,24 @@ jobs:
 
       - name: Switch branch
         continue-on-error: true
+        shell: sh +e {0}
         run: |
-          BRANCH=${GITHUB_HEAD_REF##*/}
+          BRANCH="master"
+          if [ "$GITHUB_EVENT_NAME" = "pull_request" ]; then
+            git ls-remote --exit-code --heads "https://github.com/rdkcentral/rialto.git" ${{ github.event.pull_request.head.ref }} > /dev/null
+            if [ $? -eq 0 ]; then
+              BRANCH="${{ github.event.pull_request.head.ref }}"
+            else
+              git ls-remote --exit-code --heads "https://github.com/rdkcentral/rialto.git" ${{ github.event.pull_request.base.ref}} > /dev/null
+              if [ $? -eq 0 ]; then
+                BRANCH="${{ github.event.pull_request.base.ref }}"
+              else
+                BRANCH="master"
+              fi
+            fi
+          fi
           cd rialto
-          # This will fail if there's no corresponding branch in rialto
-          # ...but that's ok since we set continue-on-error
-          git checkout $BRANCH
+          git checkout "$BRANCH"
 
       - name: Native build Rialto
         run: |