Release Procedure

1. review pyproject.toml, update dependency version constraints as needed
2. bump downloader docker image versions in default.cfg, including occasional rebuild of miniwdl_tools
3. test alternate backends: prove -v tests/{podman,singularity,udocker}.t
4. manual macOS testing: pytest -v --tb=short tests
5. git tag -a vX.Y.Z on main branch
6. push to GitHub & await CI success
7. fast-forward release and vX.Y branches to the vX.Y.Z tag; push them to GitHub.
8. release to PyPI: make pypi
9. create & groom GitHub Release
10. conda: merge the automatic PR opened on miniwdl-feedstock, updating dependency versions as needed; double-check the conda-forge build succeeds after merging.
11. double-check documentation auto-updated, or otherwise troubleshoot Read the Docs build
12. smoke tests:

    docker run --rm -it -v /var/run/docker.sock:/var/run/docker.sock -v /tmp:/tmp ubuntu:20.04 \
      bash -c 'apt-get -qq update && apt-get install -y python3-pip && pip3 install miniwdl && miniwdl run_self_test'
    
    docker run --rm -it -v /var/run/docker.sock:/var/run/docker.sock -v /tmp:/tmp continuumio/miniconda3 \
      bash -c 'conda install -y -c conda-forge miniwdl && miniwdl run_self_test'