ci: mypy in linting github action

.github/workflows/test.yml

@@ -11,7 +11,7 @@ on:
 
 jobs:
   lint:
-    name: Linting (pre-commit)
+    name: Linting (pre-commit and mypy)
     runs-on: ubuntu-latest
     steps:
     - name: Checkout the repo
@@ -24,8 +24,25 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: "3.8"
-    - name: Run pre-commit action
-      uses: pre-commit/[email protected]
+    - name: Update pip
+      run: python -m pip install --upgrade pip
+    - name: Get pip cache dir
+      id: pip-cache
+      shell: bash
+      run: echo "DIR=$(pip cache dir)" >> $GITHUB_OUTPUT
+    - name: Get current week number
+      id: get-week
+      shell: bash
+      run: echo "WEEK=$(date +'%V')" >> $GITHUB_OUTPUT
+    - name: Pip cache
+      uses: actions/cache@v4
+      with:
+        path: ${{ steps.pip-cache.outputs.DIR }}
+        key: ${{ runner.os }}-pip-${{ steps.get-week.outputs.WEEK }}-${{ hashFiles('setup.cfg') }}
+    - name: Install tox
+      run: python -m pip install tox
+    - name: Run linters with tox
+      run: python -m tox -e linters
 
   tests:
     name: Test it!