Use ruff for linting

Author: coder8080

Dockerfile.lint

@@ -2,9 +2,9 @@ FROM pypy:3
 
 WORKDIR /usr/src/app
 
-RUN pip install flake8 --no-cache-dir 
+RUN pip install ruff
 COPY requirements.txt .
-RUN pip install -r requirements.txt --no-cache-dir 
+RUN pip install -r requirements.txt --no-cache-dir
 COPY . .
 
-CMD ["python", "-m", "flake8", "./src"]
+CMD ["ruff", "check", "--extend-select", "I"]