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added dockerfile and workflow for CI #5

	name: Python lint

	on:
	push:
	branches: [main]

	jobs:
	validate:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
	steps:
	- name: checkout code
	uses: actions/checkout@v4

	- name: setup python ${{ matrix.python-version}}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version}}


	- name: install dependencies
	run: pip install -r requirements.txt

	- name: run linter
	run: flake8 app.py