limit concurrency on the usage of the acceptance testing environment

Author: ramonsnir

.github/workflows/test.yml

@@ -56,6 +56,8 @@ jobs:
     name: Terraform Provider Acceptance Tests
     needs: build
     runs-on: ubuntu-latest
+    concurrency:
+      group: acc-tests-netlify
     timeout-minutes: 15
     strategy:
       fail-fast: false