added dockerfile

Dockerfile

@@ -0,0 +1,15 @@
+# Build stage
+FROM rust:1.75 as builder
+WORKDIR /usr/src/app
+COPY . .
+RUN cargo build --release
+
+# Test stage
+FROM builder as test
+RUN cargo test
+
+# Production stage
+FROM debian:bookworm-slim as production
+WORKDIR /usr/src/app
+COPY --from=builder /usr/src/app/target/release/ballbot .
+CMD ["./ballbot"]