Add pinned Rust version via rust-toolchain.toml #7546
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As part of enabling reproducible builds we need to build a given commit with a pinned Rust version.
This commit adds a minimal rust-toolchain.toml file that specifies this version (this Rust version is enforced by rustup when invoking a cargo command).
In the container we extract the version that is specified in rust-toolchain.toml to ensure that the container is pre-built with the correct Rust version (so that when buildling in the container we do not need to download the right Rust version).
Related: #5680
This change is