add Dockerfile

bot/docker/Dockerfile

@@ -0,0 +1,31 @@
+FROM rust:1.83.0-bookworm AS planner
+RUN cargo install cargo-chef
+
+WORKDIR /app
+# Copy the whole project
+COPY . .
+# Prepare a build plan ("recipe")
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM rust:1.83.0-bookworm AS builder
+RUN cargo install cargo-chef
+WORKDIR /app
+
+# Copy the build plan from the previous Docker stage
+COPY --from=planner /app/recipe.json recipe.json
+
+# Build dependencies - this layer is cached as long as `recipe.json`
+# doesn't change.
+RUN cargo chef cook --recipe-path recipe.json
+
+# Build the whole project
+COPY . .
+RUN cargo build --profile release
+
+# Run the project
+FROM rust:1.83.0-bookworm AS runner
+WORKDIR /app
+
+COPY --from=builder /app/target/release/bot /app/bot
+
+ENTRYPOINT ["/app/bot"]