• Add --create flag to buf push to create a repository if it does not exist. The user
  is also required to specify the visibility using --create-visibility.
• Add github-actions error format to print errors in a form parseable by GitHub Actions.
• Fix issue in buf build and buf generate where the use of type filtering (via
  --type flags) would cause the resulting image to have no source code info, even
  when --exclude-source-info was not specified. The main impact of the bug was that
  generated code would be missing comments.
• Fix issue in buf curl when using --user or --netrc that would cause a malformed
  Authorization header to be sent.
• Update the module cache to use an optimized content addressable store. The cache is
  now self-healing and uses significantly less space. Users wishing to free unused space
  can run buf mod --clear-cache once after upgrading to remove data stored in the
  previous module cache.