Fix Github action workflow

Author: laurentpellegrino

.github/workflows/tests.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, 3.10]
+        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10']
 
     steps:
       - uses: actions/checkout@v2
@@ -21,3 +21,5 @@ jobs:
         run: poetry install
       - name: Run tests
         run: poetry run pytest
+        env:
+          IPREGISTRY_API_KEY: ${{ secrets.IPREGISTRY_API_KEY }}