fix: codecov try specifying the environment (#982)

Author: nh13

.github/workflows/unittests.yaml

@@ -5,6 +5,7 @@ on: [push, pull_request]
 jobs:
   test:
     runs-on: ubuntu-latest
+    environment: github-actions
     steps:
       - name: Checkout
         uses: actions/checkout@v2