Rename docker build script

tools/build-docker

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+source .env
+
+docker pull ${PHP_BASE_IMAGE}
+docker pull ${NODE_IMAGE}
+
+docker build \
+    --file docker/Dockerfile \
+    --build-arg PHP_BASE_IMAGE=${PHP_BASE_IMAGE} \
+    --tag ${PHP_IMAGE} \
+    $PWD