implemented workflow for benchmarking

Author: chernser

.github/workflows/benchmarks.yml

@@ -10,6 +10,16 @@ on:
       pr:
         description: "Pull request#"
         required: false
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    paths-ignore:
+      - "**.md"
+      - "**/docs/**"
+      - "**/LICENSE"
+      - "**/NOTICE"
 
 env:
   CHC_BRANCH: "main"