adjust nightly test sdcheduling

.github/workflows/nightly-tests.yml

@@ -3,14 +3,29 @@ name: Nightly Tests Intel GPUs
 on:
   schedule:
     - cron: '* * * * *' 
-  workflow_dispatch:  # Allows manual triggering
-
-concurrency:
-  group: ${{ github.workflow }}
-  cancel-in-progress: false
 
 jobs:
+  check-queue:
+    runs-on: ubuntu-latest
+    outputs:
+      should_run: ${{ steps.check.outputs.should_run }}
+    steps:
+      - name: Check workflow status
+        id: check
+        run: |
+          queued_or_in_progress=$(gh run list --workflow "${{ github.workflow }}" --json status --jq '.[] | select(.status=="queued" or .status=="in_progress") | .status' | wc -l)
+          echo "Number of queued or in-progress runs: $queued_or_in_progress"
+          if [ "$queued_or_in_progress" -eq "0" ]; then
+            echo "should_run=true" >> $GITHUB_OUTPUT
+          else
+            echo "should_run=false" >> $GITHUB_OUTPUT
+          fi
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
   unit-tests-llvm-19-release:
+    needs: check-queue
+    if: needs.check-queue.outputs.should_run == 'true'
     runs-on: [self-hosted, X64]
     steps:
       - name: Checkout repository
@@ -23,3 +38,4 @@ jobs:
         shell: bash
         run: |
           cp -r /space/chipStar/build ./ && ./scripts/unit_tests.sh release llvm-19 --skip-build --num-tries 10
+