Make docker setup work consistently cross-platform

.gitattributes

@@ -0,0 +1,2 @@
+# Normalize EOL for all files that Git considers text files
+* text=auto eol=lf

docker/php/init/docker-entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 echo "Checking if MariaDB is reachable..."
 exec wait-for-it.sh mariadb:3306 -s -t 30 -- init.sh

docker/php/init/init.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Only do this once.
 CONTAINER_ALREADY_STARTED="/tmp/CONTAINER_ALREADY_STARTED"