fix: awscli arch is hardcoded (aarch64 broken)

[khannz]

Issue #, if available: #358

Description of changes: Using standard way to detect ID of system architecture (uname -m), fix hardcoded x86_64 ID, which is not working for ARM architectures.

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[miceg]

Good tip, but this PR changes more than just fetching the correct architecture, and those changes aren't necessary:

• The script uses set -e, so &&-chaining is redundant.
• Using curl -P with a changing URL means you've needed to make all your later steps account for it. The existing curl -o means the awscli ZIP will always be written to the same spot, regardless of URL.

All you need to do to fetch the correct awscli architecture is a 1 line change from:

curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o $zip_file

to:

curl "https://awscli.amazonaws.com/awscli-exe-linux-$(uname -m).zip" -o $zip_file

You (or anyone else) are more than welcome to take this change for your own PR 😄

[greg-seesaw]

You (or anyone else) are more than welcome to take this change for your own PR 😄

FYI, looks like #332 does this