fix ci parallelism

Signed-off-by: karthik2804 <[email protected]>

Author: karthik2804

.github/workflows/build.yaml

@@ -13,6 +13,11 @@ on:
 permissions:
   contents: write
 
+# Construct a concurrency group to be shared across workflow runs.
+# The default behavior ensures that only one is running at a time, with
+# all others queuing and thus not interrupting runs that are in-flight.
+concurrency: ${{ github.workflow }}
+
 env:
   PROGRAM_NAME: trigger-command