update chmod command

[crd477]

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Description

There is a small error in the instructions for reproducible builds. The chmod instructions include the public tag meant for the ./build.sh command in the next step, but public is not a file or directory:

$ chmod +x ./build.sh public
chmod: cannot access 'public': No such file or directory

[ayumi-signal]

Thanks for catching this and submitting a fix! We've merged it internally and it will be available with the next beta release.