What happened?

While working on recent issues:

• Add cytoolz as dependency conda#11589
• Missing tlz import during build conda#11698
• Drop cytoolz usage #4556
• Revert dropping conda._vendor.toolz conda#11704
• Require toolz & soften cytoolz dependency conda#11700
• Add conda._vendor.toolz fallback for tlz conda#11709
• Resolve prefix injection conda#11666
• Canary build workflow clones HEAD not the triggering commit conda#11724
• Debugging borked builds conda#11720

we found that conda-build invokes conda via python -m in a few instances, causing issues when building conda itself:

• https://github.com/conda/conda/actions/runs/2820051398
• https://github.com/conda/conda/actions/runs/2835251119

Instead of invoking and using the installed conda to build the new package, conda-build manages to invoke the source code. This appears to be a result of the python -m side-effect.