Dockerfile for WASM build's webserver

.dockerignore

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+fly.toml
+.git/
+target/

Dockerfile

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+FROM rust:1.89 as builder
+
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends libasound2-dev libudev-dev
+RUN rustup target add wasm32-unknown-unknown
+RUN cargo install --locked wasm-bindgen-cli
+
+# Copy only the package manifest and source code. Otherwise changes to anything
+# will cause Docker to re-run `cargo build` even when the source hasn't changed.
+COPY src/ ./src
+COPY Cargo.toml ./Cargo.toml
+
+RUN cargo build --target wasm32-unknown-unknown --profile=wasm-release
+RUN wasm-bindgen --no-typescript --target web --out-dir ./out/ --out-name "boids" target/wasm32-unknown-unknown/wasm-release/another-boids-in-rust.wasm
+COPY www/index.html out/index.html
+
+FROM busybox
+RUN mkdir -p /var/www
+COPY --from=builder ./out/ /var/www
+WORKDIR /var/www
+
+# TODO: Make httpd accept interrupt signals so the container exits properly.
+# (<ctrl>+c and `docker stop ...` don't work because Busybox doesn't answer)
+CMD ["httpd", "-f", "-p", "8080"]