✨ Add docker image

docker/README.md

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+# `cannon-rs` Docker
+
+This folder contains the Dockerfile for the `cannon-rs` binary.
+
+## Building
+
+Dependencies: [Docker](https://www.docker.com/)
+
+```sh
+./build.sh
+```

docker/build.sh

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+#!/bin/bash
+
+# Grab the directory of this script.
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+echo "Building binary..."
+cargo build --release --bin cannon
+
+# Check if `docker` is installed
+if ! command -v docker &> /dev/null
+then
+    echo "Error: docker not found. Please install docker and try again."
+    exit
+fi
+
+echo "Building image..."
+docker build -f cannon-rs.dockerfile $DIR/.. -t cannon-rs

docker/cannon-rs.dockerfile

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+FROM alpine:3.14
+
+COPY target/release/cannon /usr/local/bin