feat(docker): add docker functionality.

Dockerfile

@@ -0,0 +1,30 @@
+FROM rust
+
+COPY Cargo.toml /app/Cargo.toml
+
+WORKDIR /app
+
+RUN mkdir src && \
+    echo "fn main() {println!(\"if you see this, the build broke\")}" > src/main.rs && \
+    cargo build --release && \
+    rm -r target/release/deps/bumblebee*
+
+COPY src /app/src
+
+RUN cargo build --release
+
+RUN cp target/release/bumblebee /app/bumblebee
+
+# -- #
+
+COPY docker/docker-entrypoint.sh /docker-entrypoint.sh
+COPY docker/docker-entrypoint.d/ /docker-entrypoint.d
+RUN chmod +x /docker-entrypoint.sh
+
+ENV CONFIG_PATH=/config/config.toml
+
+VOLUME /config
+VOLUME /data/input
+VOLUME /data/output
+
+ENTRYPOINT ["/docker-entrypoint.sh"]