Try again with the worfklow threads

.github/workflows/tests.yml

@@ -6,6 +6,10 @@ on:
   pull_request:
     branches: [ master ]
 
+env:
+  OMP_NUM_THREADS=2
+  MKL_NUM_THREADS=2
+
 jobs:
   test:
     name: Run tests on ${{ matrix.os }} with Python ${{ matrix.python }}
@@ -38,8 +42,5 @@ jobs:
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
         pip install git+https://github.com/mapillary/inplace_abn.git@v1.0.11
     - name: Run tests
-      env:
-        OMP_NUM_THREADS=2
-        MKL_NUM_THREADS=2
       run: |
         pytest -vv --durations=0 ./tests