The Xcode Archive & Export for iOS Step fails with the following error:
/Users/vagrant/git/Pods/Target Support Files/nanopb/XXXX:13:9: double-quoted include "pb.h" in framework header, expected angle-bracketed instead [-Werror,-Wquoted-include-in-framework-header]
This is a Cocoapods issue that occurs because Xcode 12 expects umbrella headers to use <> for imports instead of "" .
The workaround is simple: in the Xcode build settings for all Pods, set CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER option to NO.