ci: make docpublish safer

Signed-off-by: Kari Hamalainen <kari.hamalainen@nordicsemi.no>

Author: karhama

.github/workflows/docpublish.yml

@@ -28,6 +28,7 @@ jobs:
           echo "OUTDIR=$OUTDIR" >> "$GITHUB_ENV"
           unzip legacy-ncs*.zip -d $OUTDIR
           find "$OUTDIR" -type l -delete
+          echo "what is head: ${{ github.event.workflow_run.head_branch }}"
 
       - name: Obtain PR number
         working-directory: docs
@@ -45,14 +46,8 @@ jobs:
          azcopy cp $OUTDIR "${{ vars.NCS_DOC_STORAGE_URL }}?${{ secrets.NCS_DOC_SAS}}" --recursive=true
 
       - name: Upload Zoomin documentation
+        if: ${{ github.event.workflow_run.head_branch == 'main' }}
         run: |
-          for file in docs/monitor*.txt; do
-            if ! grep -q main ${file}; then
-              echo "Not targeting main, skipping Zoomin upload"
-              exit 0
-            fi
-          done
-
           # trust server
           mkdir -p ~/.ssh
           ssh-keyscan upload-v1.zoominsoftware.io >> ~/.ssh/known_hosts