Enable isort workflow

.github/workflows/linters.yml

@@ -21,20 +21,18 @@ jobs:
           linters: flake8
           run: flake8
 
-# TODO: re-enable it in another PR, want to keep
-# the actions Pr clean
-#   isort:
-#     runs-on: ubuntu-latest
-#     steps:
-#       - name: Checkout
-#         uses: actions/checkout@v2
-#       - name: Set up Python
-#         uses: actions/setup-python@v2
-#         with:
-#           python-version: 3.9
-#       - run: python -m pip install isort
-#       - name: isort
-#         uses: liskin/gh-problem-matcher-wrap@v1
-#         with:
-#           linters: isort
-#           run: isort --check --diff cms
+  isort:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - run: python -m pip install isort
+      - name: isort
+        uses: liskin/gh-problem-matcher-wrap@v1
+        with:
+          linters: isort
+          run: isort --check --diff cms