How do I use Docker environment variable in ENTRYPOINT array? : <p>If I set an environment variable, say <code>ENV ADDRESSEE=world</code>, and I want to use it in the entry point script concatenated into a fixed string like:</p>

<pre><code>ENTRYPOINT ["./greeting", "--message", "Hello, world!"]
</code></pre>

<p>with <code>world</code> being the value of the environment varible, how do I do it? I tried using <code>"Hello, $ADDRESSEE"</code> but that doesn't seem to work, as it takes the <code>$ADDRESSEE</code> literally.</p>
