minor fixes for 4.1.0a1 #329

	name: tests
	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]
	workflow_dispatch:

	jobs:
	build:
	runs-on: ubuntu-latest
	if: ${{ github.repository == 'facebookresearch/demucs' \|\| github.event_name == 'workflow_dispatch' }}
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-python@v2
	with:
	python-version: 3.8

	- uses: actions/cache@v2
	with:
	path: env
	key: env-${{ hashFiles('*/requirements.txt', '.github/workflows/') }}

	- name: Install dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install -y ffmpeg
	python3 -m venv env
	. env/bin/activate
	python -m pip install --upgrade pip
	pip install -r requirements.txt

	- name: Run separation test
	run: \|
	. env/bin/activate
	make test_eval

Provide feedback