title: How to use escape character in dockerfile ENV command
body: <p>I am attempting to provide a custom prompt to a docker based VSCode development environment, the same prompt that works on my host machine. However, the value is becoming encoded causing all the <code>\</code> characters to be doubled. Hence,</p>
  <pre><code>ENV PS1=\[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ 
  </code></pre>
  <p>becomes</p>
  <pre><code>\[\]\[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ \[\]
  </code></pre>
  <p>How do I provide escape characters</p>