httpd: update cargo-zigbuild version to 0.20 httpd: Dockerfile uses Rust version from rust-toolchain

Instead of hardcoding the version of the Rust alpine file, introduce an ARG in the Dockerfile. In build/build, we determine the version by inspecting rust-toolchain.toml, and pass this value in. This ensures that the binaries are built using the same toolchain that we develop with.

Co-authored-by: Fintan Halpenny fintan.halpenny@gmail.com

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