[python] ensure rust compiler is available for package install

[brettlangdon]

Motivation

We are considering add rust native extensions to the dd-trace-py Python package. In order to support that, we need a rust compiler available for us.

Changes

Install rust compiler during install_ddtrace.sh.

I decided on install_ddtrace.sh instead of adding to the base images to make it potentially easier to keep build dependencies in one place.

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes (if something not related to your task is failing, you can ignore it)
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner. We're working on refining the codeowners file quickly.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• Relevant label (run-parametric-scenario, run-profiling-scenario...) are presents
• If PR title starts with [<language>], double-check that only <language> is impacted by the change
• No system-tests internal is modified. Otherwise, I have the approval from R&P team
• CI is green, or failing jobs are not related to this change (and you are 100% sure about this statement)
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added (or removed)?
  • Get a review from R&P team

[juanjux]

[juanjux]

nit: maybe would be safer to cache the script in the repository? Just in case rustup.rs is compromised, trough this a docker image so consider this a non blocking nit.

[brettlangdon]

not sure, this is similar to what we do in other places... but... 🤷🏻