fix(Docker): Tweak entrypoint permissions (#17698)

* fix(Docker): Fix entrypoint permissions

* use entrypoint.sh as an argument to bash

* attempt to use more specified filepaths

apps/docker/entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -euo pipefail
 
 # Copy all default config files to env/dist/etc if they don't already exist