[fbsync] Run M1 unit-tests in every PR (#6324)

Reviewed By: NicolasHug

Differential Revision: D38351753

fbshipit-source-id: 1f5e0ebb4675f5300261ed777e9bcf096435813a

Author: datumbox

.github/workflows/test-m1.yml

@@ -1,8 +1,6 @@
 name: Unit-tests on M1
 on:
   pull_request:
-    paths:
-      - .github/workflows/test-m1.yml
   push:
     branches:
       - nightly