Add a new option --builder or -B, which takes an argument of either "sbuild" or "pbuilder" (and obviously others if we add support for more builders in the future). If -B isn't specified, check SPONSOR_PATCH_BUILDER, and if that's unset, default to pbuilder (to maintain current behavior)
Here's a proposed interface we could use:
Add a new option --builder or -B, which takes an argument of either "sbuild" or "pbuilder" (and obviously others if we add support for more builders in the future). If -B isn't specified, check SPONSOR_ PATCH_BUILDER, and if that's unset, default to pbuilder (to maintain current behavior)