Advent of Code solutions in Rust

[WIP] ci: add workflow for building project on tangled spindle

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.tangled/workflows/rust.yml
··· 1 + when: 2 + - event: ["push"] 3 + branch: ["main"] 4 + - event: ["pull_request"] 5 + branch: ["main"] 6 + 7 + engine: "nixery" 8 + 9 + steps: 10 + - name: hello world 11 + command: | 12 + echo "Hello, world"