Add cache deps back

Author: yakser

.github/workflows/django-test.yml

@@ -30,6 +30,13 @@ jobs:
           virtualenvs-create: true
           virtualenvs-in-project: true
 
+      - name: cache deps
+        id: cache-deps
+        uses: actions/cache@v2
+        with:
+          path: .venv
+          key: pydeps-${{ hashFiles('**/poetry.lock') }}
+
       - run: poetry install --no-root
         if: steps.cache-deps.outputs.cache-hit != 'true'