Verify that backend environment solving picks up the mirror config#26

Hofer-Julian wants to merge 4 commits intoprefix-dev:mainprefix-dev/pixi-build-testsuite:mainfrom

Hofer-Julian:feature/pix-818-private-channel-authentication-error-with-local-conda-srcHofer-Julian/pixi-build-testsuite:feature/pix-818-private-channel-authentication-error-with-local-conda-srcCopy head branch name to clipboard