Reid Baker 6f6ca74b5e Protect sdk upload script from missing ndk, add documentation for checking write access, improve comments to add context (flutter/engine#47989)
Script used to upload 34v7 with ndk 26.1.10909125 
Added documentation for how to check for write access before running script. 
Added documentation for why the ndk is in a non standard location. 
Protected against silent ndk failure caused by a failure to download ndk on m1 macs https://github.com/flutter/engine/pull/47609#issuecomment-1800207937
Clean up os override so that script does not dirty the environment variables in a shell where it is run.  

See https://github.com/flutter/flutter/issues/117973 for more detail on why a newer ndk is required.
2023-11-20 20:42:23 +00:00
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