build: add Dockerfile

Dockerfile

@@ -0,0 +1,21 @@
+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"]