fix: dont fail silently on awscli errors during artifact setup #5150
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If something goes wrong during aws s3 cp, exit early with an error message instead of quietly trying to soldier on. A common(-ish) cause of something going wrong here is having installed the aws cli for the wrong CPU architecture (e.g. x86 awscli on ARM64), as the awscli installer apparently doesnt not check the architecture, and its easy to copy the wrong command from the website.
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