Add a new CI job to check that smithy-rs compiles on 32bit Linux-based targets

[LukeMathWalker]

Motivation and Context

Ensure we do not regress on #1810

Description

This initial PR makes sure that smithy-rs compiles on a few 32bits Linux-based targets.
We do not attempt to run tests on those targets as it would require a more complicated setup via emulation, which (from what I could gather) would be slow to execute and impact our overall CI completion time.
This puts our confidence in correct execution on 32bit targets a bit lower than our confidence when it comes to Windows.

We successfully reproduced the failure experienced by our customers on powerpc (see run).

This PR depends on the changes in #1811, so it should be merged afterwards.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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• AWS SDK (ignoring whitespace)
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[github-actions]

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• AWS SDK (ignoring whitespace)
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• No codegen difference in the Server Test Python

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[github-actions]

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• AWS SDK (ignoring whitespace)
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python

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• AWS SDK (ignoring whitespace)
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python

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[LukeMathWalker]

It looks like aws-smithy-client has a few more feature-related bugs to squash.

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[github-actions]

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• AWS SDK (ignoring whitespace)
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python

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[github-actions]

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• AWS SDK (ignoring whitespace)
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python

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[github-actions]

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• AWS SDK (ignoring whitespace)
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python

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[github-actions]

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• AWS SDK (ignoring whitespace)
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python

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[jdisanti]

But why would you need this for ci-pr.yml? It runs every time a PR is updated.

And if it is run via workflow dispatch, how does it get values needed by the PR bot:

      issue_number: ${{ github.event.number }}
      base_revision: ${{ github.event.pull_request.base.sha }}
      head_revision: ${{ github.event.pull_request.head.sha }}

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• AWS SDK (ignoring whitespace)
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python

A new doc preview is ready to view.