check if the package file has changed rather then if a node muodules exists

Author: butlerx

.gitignore

@@ -35,3 +35,4 @@ web/locale/*
 !web/locale/en_US
 email-templates/*
 !email-templates/*-en_US
+.pkg.sha1

docker-entrypoint.sh

@@ -1,6 +1,11 @@
 #! /usr/bin/env sh
+set -e
 cd /usr/src/app || exit
-if [ ! -d "node_modules" ]; then
+touch .pkg.sha1
+OLD_SHA=$(cat .pkg.sha1)
+NEW_SHA=$(sha1sum package.json)
+if [ "$OLD_SHA" != "$NEW_SHA" ]; then
+  echo "$NEW_SHA" > .pkg.sha1
   npm install
   rm -rf node_modules/cp-translations
   ln -s /usr/src/cp-translations node_modules/cp-translations