Accelerate Rust compilation time with workspace dependencies

[jpraynaud]

Why

We want to reduce the compilation times in the repository and we have noticed that some common dependencies to our crates are rebuilt too frequently: small modifications in the code can lead to high compilation time.

What

Declare common dependencies in the workspace to avoid recompiling them too frequently.

How

• Identify the common dependencies (e.g. serde, clap, tokio, ...)
• In the Cargo.toml file of the workspace, add the common dependencies and their common features (use the intersection)
• Assess that compile times are lower
• Adapt the dependency upgrade:
  • script
  • runbook?