Devbox setup writes to /usr/bin

[richardcase]

/kind bug

What steps did you take and what happened:

With the new Devbox changes it downloads and installs envsubst into /usr/bin. This is fine for when devbox is used within a devcontainer but not good for anyone that uses devbox on their machine directly.

Replaced existing envsubst with the new one at /usr/bin/envsubst

What did you expect to happen:

I'd expect envsubst to be either:

1. Be installed via Nix
2. Or installed into bin folder in the project directory

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Cluster-api-provider-aws version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

//cc @faermanj

[richardcase]

/help
/good-first-issue
/triage accepted

[k8s-ci-robot]

@richardcase:
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/good-first-issue
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