feat: add optional mime_type property to DRS object #408

	name: Lint
	on:
	push:
	branches:
	- master
	pull_request:
	jobs:
	lint:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [ "3.10" ]
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	name: Set up Python
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install poetry
	run: pip install poetry
	- name: Install dependencies
	run: poetry install
	- name: Lint
	run: \|
	poetry run black --check ./chord_drs ./tests

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