build: add Dockerfile

.dockerignore

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+### direnv ###
+.direnv
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+# Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+
+# Added by cargo
+
+/target
+
+Dockerfile
+.dockerignore

Dockerfile

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+FROM lukemathwalker/cargo-chef:latest-rust-1 AS chef
+WORKDIR /app
+
+FROM chef AS planner
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM chef AS builder 
+COPY --from=planner /app/recipe.json recipe.json
+# Build dependencies - this is the caching Docker layer!
+RUN cargo chef cook --release --recipe-path recipe.json
+# Build application
+COPY . .
+RUN cargo build --release --bin complete-rss
+
+# We do not need the Rust toolchain to run the binary!
+FROM debian:bookworm-slim AS runtime
+WORKDIR /app
+EXPOSE 3030
+COPY --from=builder /app/target/release/complete-rss /usr/local/bin
+ENTRYPOINT ["/usr/local/bin/complete-rss"]