added cancel script

.github/workflows/cancel.yml

@@ -0,0 +1,17 @@
+# This action finds in-progress Action jobs for the same branch, and cancels
+# them. There's little point in continuing to run superceded jobs.
+
+name: cancel
+
+on:
+  push:
+
+jobs:
+  cancel:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Cancel Previous Runs
+      uses: styfle/cancel-workflow-action@0.9.0
+      with:
+        access_token: ${{ github.token }}
+        workflow_id: test.yml