Adding build file

build.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+set -eo pipefail
+APP_NAME=$1
+UPDATE_CACHE=""
+echo "" > docker/api.env
+docker build -f docker/Dockerfile -t $APP_NAME:latest .
+docker create --name app $APP_NAME:latest
+
+if [ -d node_modules ]
+then
+  mv package-lock.json old-package-lock.json
+  docker cp app:/usr/src/app/package-lock.json package-lock.json
+  set +eo pipefail
+  UPDATE_CACHE=$(cmp package-lock.json old-package-lock.json)
+  set -eo pipefail
+else
+  UPDATE_CACHE=1
+fi
+
+if [ "$UPDATE_CACHE" == 1 ]
+then
+  docker cp app:/usr/src/app/node_modules .
+fi