(Q) How to address permission denied (publickey) in circle builds?

When you see this error in a circle build:

Permission denied (publickey).

fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
Exited with code 128

open a new issue with a comment @conda-forge-admin, please update circle. Once our web services updated the circle configuration, restart the build.

(Q) Why does conda-build ignore the py37 selector in meta.yaml?

TL;DR: replace py37 with py==37.

conda-build has changed the selector syntax. You are now encouraged to use py==<version>, instead of py<version>. While the legacy selectors py27 and py36 are still valid, py37 and higher are not available anymore.

Please use the new syntax py==27, py==36 and py==37 to avoid confusion.