Update node-armhf template

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

.gitignore

@@ -5,3 +5,4 @@ build
 .gradle
 .idea
 **/bin/**
+.settings

template/node-armhf/.dockerignore

@@ -0,0 +1 @@
+*/node_modules

template/node-armhf/Dockerfile

@@ -7,37 +7,42 @@ RUN chmod +x /usr/bin/fwatchdog
 
 RUN addgroup -S app && adduser app -S -G app
 
-RUN apk add --no-cache nodejs nodejs-npm ca-certificates
+WORKDIR /root/
+
+# Turn down the verbosity to default level.
+ENV NPM_CONFIG_LOGLEVEL warn
 
 RUN mkdir -p /home/app
 
 # Wrapper/boot-strapper
 WORKDIR /home/app
+COPY package.json ./
 
-COPY package.json   .
+# This ordering means the npm installation is cached for the outer function handler.
+RUN npm i --production
 
-RUN npm i
+# Copy outer function handler
+COPY index.js ./
 
+# COPY function node packages and install, adding this as a separate
+# entry allows caching of npm install runtime dependencies
 WORKDIR /home/app/function
+COPY function/*.json ./
+RUN npm i --production || :
 
-COPY index.js       .
-COPY function       function
-
-ENV NPM_CONFIG_LOGLEVEL warn
-RUN npm i || :
-
+# Copy in additional function files and folders
 COPY --chown=app:app function/ .
 
 WORKDIR /home/app/
 
+# chmod for tmp is for a buildkit issue (@alexellis)
 RUN chmod +rx -R ./function \
     && chown app:app -R /home/app \
     && chmod 777 /tmp
 
 USER app
 
 ENV cgi_headers="true"
-
 ENV fprocess="node index.js"
 EXPOSE 8080
 

template/node-armhf/template.yml

@@ -1,2 +1,13 @@
 language: node-armhf
 fprocess: node index.js
+welcome_message: |
+  This template is designed for Raspberry Pi / ARM.
+
+  You have created a new function which uses Node.js 12 (LTS) and the OpenFaaS
+  Classic Watchdog.
+
+  npm i --save can be used to add third-party packages like request or cheerio
+  npm documentation: https://docs.npmjs.com/
+
+  For high-throughput services, we recommend you use the node12 template which
+  uses a different version of the OpenFaaS watchdog.