v0.5.0

Changed

• Major refactor of shelley to be more modular and less repetitive to support
  incoming CVMFS repos
• Large and messy CVMFSModuleBuilder class replaced with a new set of core classes and functions
  for better error handling and reusability
• New logic for build so artefacts are deleted when a build is cancelled or
  fails. This ensures shelley clean doesn't leave any stray artefacts.
• Version ordering follows the same rules as Bioconda to account for uncommon version
  specs (e.g. 0.4.0-dev for dev work, seqtk/r93)
• If GitHub cannot be reached, the build stops before writing anything and says so,
  e.g. "Couldn't reach GitHub (raw.githubusercontent.com): the request timed out
  after 10 s. Try again in a few seconds.", instead of building a module without
  the tool's command
• Improved CVMFS error handling (e.g. all errors do not raise generic "check if CVMFS is mounted")
• Upgrade python dependencies for packaging, pytest, pytest-asyncio, mypy

Added

• conda's version-ordering code is vendored in shelley/_vendor/ (BSD-3-Clause,
  licence included), because conda cannot be installed as a library dependency.

Removed

• The 0.4.0 command code: commands/build.py, commands/find.py, commands/search.py,
  commands/clean.py, utils/batch.py, utils/cache.py and builder/cvmfs_builder.py.
  shelley.CVMFSModuleBuilder is no longer exported; shelley.cli_main is the only
  public name.

Fixed

• shelley search and shelley find -v no longer end in a traceback when output is
  piped or run from a script; with no terminal to page on, they print the first page.
• CI: ruff no longer checks the design notes under tmp/, which had made lint fail
• find version ordering fixed
• build correctly selects latest tool version