Added Dockerfile and build scripts for PETS2023

crates/lox-library/Dockerfile

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+FROM rust:1.56.0
+WORKDIR /home/lox
+ADD src/ ./src/
+ADD Cargo.toml Cargo.toml
+ADD tests/ ./tests/tests
+ADD README.md README.md
+RUN cargo build
+ENV SHELL=/bin/bash
+
+

crates/lox-library/build-lox.sh

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+#!/bin/bash
+docker rm lox 2>&1;
+docker build -t lox .

crates/lox-library/run-lox.sh

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+#!/bin/bash
+docker run -it lox /bin/bash

crates/lox-library/stop-lox.sh

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+#!/bin/bash
+docker stop lox