The webrtc/ios_api_framework recipe had a bug in it which was fixed in https://chromium-review.googlesource.com/c/chromium/tools/build/+/632620

After submitting https://codereview.webrtc.org/3001023003/ the builds started to fail and due to the recipe fix, they also show up as red (as they should) instead of previously being green anyway.
https://codereview.webrtc.org/3005513002/ tries to fix the build script being used, but ran into weird failure executing GN:

DEBUG:root:Running: ['gn', 'gen', '/b/s/w/ir/cache/builder/ios_api_framework/src/out_ios_libs/arm64_libs', '--args=target_os="ios" ios_enable_code_signing=false use_xcode_clang=true is_component_build=false is_debug=false target_cpu="arm64" ios_deployment_target="8.0" rtc_libvpx_build_vp9=false enable_ios_bitcode=true use_goma=true goma_dir="/b/s/w/ir/cache/goma_client" enable_stripping=true']

It's unclear what may have caused this error.
This bug tracks getting this back into a green state, or disable the bot for now.