Fix the [Caddy route tests
workflow](https://github.com/appsmithorg/appsmith/actions/workflows/caddy-routes-test.yml).
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Bug Fixes**
* Improved compatibility for route test container by selecting the
correct binary for the running architecture (e.g., ARM, x86), reducing
setup failures.
* **Chores**
* Streamlined binary installation in the test container by extracting
directly to the system path, removing unnecessary intermediate steps.
* Maintained existing certificate setup with no functional changes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Refactor**
- Updated base Docker image and installation processes for tools within
the Docker environment.
- **Chores**
- Modified scripts to enhance file handling and environment variable
configurations.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Another attempt at #29550, which was reverted. Fallback is not happening
if cert provisioning fails _despite_ having the correct header. But with
the changes in this PR, since we'll listen on `:80`, fallback _will_
happen when cert provisioning fails due to incorrect domain
configuration.
We're also adding [Hurl](https://hurl.dev) based tests. They're not run
in any CI yet. That'll come in soon.
