Revert "try passing environment variables for github actions"

This reverts commit cc51acf.

Author: delabiejochen

.github/workflows/test.yml

@@ -10,7 +10,4 @@ jobs:
     steps:
       - uses: actions/checkout@v2.1.0
       - run: dotnet test
-        env:
-          TESTINGBOT_KEY: ${{ env.TESTINGBOT_KEY }}
-          TESTINGBOT_SECRET: ${{ env.TESTINGBOT_SECRET }}