WIP on integration tests in Docker

bin/runtests.sh

test/Dockerfile

test/docker-compose.yml

test/integration_tests/conftest.py

test/integration_tests/test_collection.py

test/integration_tests/test_containers.py

test/integration_tests/test_download.py

test/integration_tests/test_errors.py

test/integration_tests/test_groups.py

test/integration_tests/test_notes.py

test/integration_tests/test_permissions.py

test/integration_tests/test_roles.py

test/integration_tests/test_tags.py

test/integration_tests/test_users.py

test/requirements-integration-test.txt