add docker files

.dockerignore

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+/target

Dockerfile

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+# Leveraging the pre-built Docker images with
+# cargo-chef and the Rust toolchain
+# https://www.lpalmieri.com/posts/fast-rust-docker-builds/
+FROM --platform=${BUILDPLATFORM:-linux/amd64} lukemathwalker/cargo-chef:latest-rust-1.63.0 AS chef
+WORKDIR /coach
+
+FROM chef AS planner
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM chef as builder
+
+WORKDIR /coach
+
+COPY --from=planner /coach/recipe.json recipe.json
+
+RUN apt-get update && apt-get install -y clang cmake && rustup component add rustfmt
+
+# Build dependencies - this is the caching Docker layer!
+RUN cargo chef cook --release --recipe-path recipe.json
+
+COPY . .
+
+# Build actual target here
+RUN cargo build --release
+
+RUN mv target/release/coach /coach/coach
+
+FROM debian:11-slim
+ARG APP=/coach
+
+RUN apt-get update \
+    && apt-get install -y ca-certificates tzdata \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV TZ=Etc/UTC \
+    RUN_MODE=production
+
+RUN mkdir -p ${APP}
+
+COPY --from=builder /coach/coach ${APP}/coach
+
+WORKDIR ${APP}
+
+CMD ["./coach"]