fix bm invoker (#322)

* added if to the bm invoker

* added label name

Author: meiravgri

.github/workflows/benchmark-labeled.yml

@@ -9,6 +9,14 @@ on: # TODO: delete this file when specifying a label is supported
       - '*noci'
 
 jobs:
+  check:
+    name: check if label '${{ github.event.label.name }}' triggers benchmarks
+    runs-on: ubuntu-latest
+    steps:
+      - id: print
+        run: echo ${{ github.event.label.name }}
   bm_invoker: 
+    needs: check
+    if: startsWith(github.event.label.name, 'bm') || startsWith(github.event.label.name, 'benchmarks')
     uses: ./.github/workflows/benchmark.yml
     secrets: inherit