disabled test action for PRs from forks

.github/workflows/test.yml

@@ -45,6 +45,7 @@ jobs:
           go build -v .
   # run acceptance tests in a matrix with Terraform core versions
   test:
+    if: github.event.pull_request.head.repo.name == github.repository
     environment: TestingEnv
     name: Matrix Test
     needs: build