Add docker support

.dockerignore

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+irc_config.yaml
+/ircie

Dockerfile

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+FROM rust:bookworm
+WORKDIR /app
+RUN mkdir save
+RUN git clone https://github.com/ayywrk/ircie
+COPY . .
+RUN cargo build --release
+CMD ["./target/release/hardfight"]

docker-compose.yml

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+services:
+  hardfight:
+    build: .
+    volumes:
+      - "$PWD/irc_config.yaml:/app/irc_config.yaml"
+      - "$PWD/save:/app/save"