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Bump Rust version in optimal Dockerfile to 1.99 - #190

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@bahlo bahlo commented Oct 5, 2026

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sccache released v0.18 three weeks ago, which bumps MSRV to 1.91.

This means the optimal Dockerfile failed to build as it tries to install the latest version:

> [build 2/8] RUN cargo install cargo-chef sccache --locked:
#0 0.099     Updating crates.io index
#0 0.126  Downloading crates ...
#0 0.148   Downloaded cargo-chef v0.1.78
#0 0.182     Updating crates.io index
#0 0.210 error: cannot install package `sccache 0.18.0`, it requires rustc 1.91.0 or newer, while the currently active rustc version is 1.90.0
#0 0.210 `sccache 0.17.0` supports rustc 1.85.0

This bumps the Rust version to latest (1.99) on Optimal Dockerfile for Rust with cargo-chef and sccache, which fixes this error.

sccache released [v0.18](https://github.com/mozilla/sccache/releases/tag/v0.18.0) three weeks ago, which bumps MSRV to 1.91. 

This means the optimal Dockerfile failed to build as it tries to install the latest version:
```
> [build 2/8] RUN cargo install cargo-chef sccache --locked:
#0 0.099     Updating crates.io index
#0 0.126  Downloading crates ...
#0 0.148   Downloaded cargo-chef v0.1.78
#0 0.182     Updating crates.io index
#0 0.210 error: cannot install package `sccache 0.18.0`, it requires rustc 1.91.0 or newer, while the currently active rustc version is 1.90.0
#0 0.210 `sccache 0.17.0` supports rustc 1.85.0
```

This bumps the Rust version to latest (1.99), fixing this error.
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