Add flake8 checker

.github/workflows/lint.yml

@@ -0,0 +1,21 @@
+name: flake8
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.9
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flake8
+    - name: Analysing the code with flake8
+      run: flake8 .

Makefile

@@ -7,7 +7,7 @@ COMMIT_HASH=$(shell git rev-parse --short HEAD)
 check:
 ifeq ("$(wildcard ./venv-${COMMIT_HASH})","")
 	@rm -rf venv-*
-	@apt install -y python3-distutils python3-pip python3-venv >/dev/null 2>&1
+	@${PYTHON} -m pip install -U virtualenv >/dev/null 2>&1
 	@${PYTHON} -m venv venv-${COMMIT_HASH}
 	@. ./venv-${COMMIT_HASH}/bin/activate && \
 		python3 -m pip install -r requirements.txt >/dev/null 2>&1 && \