fix: Move code copy to last docker stage

[chtruong814]

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fix: Move code copy to last docker stage

Collection: [Note which collection this PR will affect]

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[chtruong814]

We probably shouldn't bake this into the container because it's a test env var. This is now passed during the CI test.

[chtruong814]

/ok to test 88c3079

[github-actions]

[🤖]: Hi @chtruong814 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully.

So it might be time to merge this PR or get some approvals.