Update `build.sh` to error-out on bad `$BUILD` or `$BIN`#1882

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wilsonjholmes wants to merge 3 commits intoKLayout:masterfrom

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Commits on Oct 5, 2024

Update build.sh to abort on shell errors (`bash -e`)
wilsonjholmes
committed
Update method of getting absolute paths to error out if they do not exist
wilsonjholmes
committed
Update comment to match implementation in build.sh: `realpath --canonicalize-existing`
wilsonjholmes
committed