Add code style check and fix commands

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
     - uses: actions/cache@v3
       with:
         path: ~/.cache/pip
-        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+        key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
         restore-keys: |
           ${{ runner.os }}-pip-
     - name: Install dependencies
@@ -23,6 +23,11 @@ jobs:
     runs-on: ubuntu-latest
     needs: setup
     steps:
+    - name: Use pip cache
+      uses: actions/cache@v3
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
     - name: Check
       run: black . --check
 
@@ -32,11 +37,6 @@ jobs:
     needs: setup
     continue-on-error: true
     steps:
-    - uses: actions/checkout@v2
-      name: Python setup
-    - uses: actions/setup-python@v2
-      with:
-        python-version: 3.8
     - name: Install pytest
       run: pip install pytest
     - name: Check for duplicate lines
@@ -65,4 +65,4 @@ jobs:
     - name: Install Unbound
       run: sudo apt-get update && sudo apt-get install -y unbound
     - name: Check unbound list
-      run: unbound-checkconf unbound.conf
+      run: unbound-checkconf unbound.conf