Run isort and black check in CI.

Author: clokep

.github/workflows/main.yml

@@ -20,10 +20,18 @@ jobs:
         with:
           python-version: "3.10"
 
-      - run: python -m pip install flake8==4.0.1 black==22.3.0 isort==5.10.1
-      - name: flake8
+      - name: "Install dependencies"
+        run: python -m pip install flake8==4.0.1 black==22.3.0 isort==5.10.1
+
+      - name: "Run flake8"
         run: flake8
 
+      - name: "Run isort"
+        run: isort --check .
+
+      - name: "Run black"
+        run: black --check .
+
   tests:
     name: "Python ${{ matrix.python-version }}"
     needs: lint