chore: switch to node:4-alpine

This is a smaller image that should speed up tests...

.circleci/config.yml

@@ -52,8 +52,8 @@ jobs:
             HEROKUISH_VERSION=$(grep HEROKUISH_VERSION deb.mk | head -n1 | cut -d' ' -f3)
             docker pull gliderlabs/herokuish:v$HEROKUISH_VERSION
             docker save -o build/herokuish.tar gliderlabs/herokuish:v$HEROKUISH_VERSION
-            docker pull node:4
-            docker save -o build/node.tar node:4
+            docker pull node:4-alpine
+            docker save -o build/node.tar node:4-alpine
       - persist_to_workspace:
           root: /home/circleci/project
           paths:

tests/apps/dockerfile-dokku-scale/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:4
+FROM node:4-alpine
 
 EXPOSE 3001/udp
 EXPOSE  3000/tcp

tests/apps/dockerfile-noexpose/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:4
+FROM node:4-alpine
 
 COPY . /app
 WORKDIR /app

tests/apps/dockerfile-procfile-bad/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:4
+FROM node:4-alpine
 
 EXPOSE 3001/udp
 EXPOSE  3000/tcp

tests/apps/dockerfile-procfile/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:4
+FROM node:4-alpine
 
 EXPOSE 3001/udp
 EXPOSE  3000/tcp

tests/apps/dockerfile/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:4
+FROM node:4-alpine
 
 EXPOSE 3001/udp
 EXPOSE  3000/tcp

tests/ci/setup.sh

@@ -133,8 +133,8 @@ setup_circle() {
     sudo -E chown dokku:ubuntu /home/dokku/.dokkurc
   fi
   sudo -E chmod 775 /home/dokku/.dokkurc
-  # pull node:4 image for testing
-  sudo docker pull node:4
+  # pull node:4-alpine image for testing
+  sudo docker pull node:4-alpine
 }
 
 case "$1" in