Update nodeinfo/alpinefunction to latest mulit-stage

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

sample-functions/AlpineFunction/Dockerfile

-FROM alpine:3.8
+FROM openfaas/classic-watchdog:0.14.4 as watchdog
 
-RUN apk --no-cache add curl \
-    && curl -sL https://github.com/openfaas/faas/releases/download/0.13.0/fwatchdog > /usr/bin/fwatchdog \
-    && chmod +x /usr/bin/fwatchdog
+FROM alpine:3.9
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
 
 # Populate example here
 # ENV fprocess="wc -l"

sample-functions/AlpineFunction/Dockerfile.arm64

-FROM alpine:3.8
+FROM openfaas/classic-watchdog:0.14.4 as watchdog
 
-RUN apk --no-cache add curl \
-    && curl -sL https://github.com/openfaas/faas/releases/download/0.13.0/fwatchdog-arm64 > /usr/bin/fwatchdog \
-    && chmod +x /usr/bin/fwatchdog
+FROM alpine:3.9
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
 
 # Populate example here
 # ENV fprocess="wc -l"

sample-functions/AlpineFunction/Dockerfile.armhf

-FROM alpine:3.8
+FROM openfaas/classic-watchdog:0.14.4 as watchdog
 
-RUN apk --no-cache add curl \
-    && curl -sL https://github.com/openfaas/faas/releases/download/0.13.0/fwatchdog-armhf > /usr/bin/fwatchdog \
-    && chmod +x /usr/bin/fwatchdog
+FROM alpine:3.9
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
 
 # Populate example here
 # ENV fprocess="wc -l"
+
 HEALTHCHECK --interval=5s CMD [ -e /tmp/.lock ] || exit 1
 CMD ["fwatchdog"]

sample-functions/NodeInfo/Dockerfile

-FROM alpine:3.8
+FROM openfaas/classic-watchdog:0.14.4 as watchdog
 
-RUN apk --update add nodejs nodejs-npm
+FROM alpine:3.9
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
 
-RUN apk --no-cache add curl \
-    && curl -sL https://github.com/openfaas/faas/releases/download/0.13.0/fwatchdog > /usr/bin/fwatchdog \
-    && chmod +x /usr/bin/fwatchdog
+RUN apk --update add nodejs nodejs-npm
 
 COPY package.json .
 COPY main.js .

sample-functions/NodeInfo/Dockerfile.arm64

-FROM alpine:3.8
+FROM openfaas/classic-watchdog:0.14.4 as watchdog
 
-RUN apk --update add nodejs nodejs-npm
+FROM alpine:3.9
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
 
-RUN apk --no-cache add curl \
-    && curl -sL https://github.com/openfaas/faas/releases/download/0.13.0/fwatchdog-arm64 > /usr/bin/fwatchdog \
-    && chmod +x /usr/bin/fwatchdog
+RUN apk --update add nodejs nodejs-npm
 
 COPY package.json .
 COPY main.js .
+
 RUN npm i
+
 ENV fprocess="node main.js"
 CMD ["fwatchdog"]

sample-functions/NodeInfo/Dockerfile.armhf

-FROM alpine:3.8
-RUN apk --no-cache add nodejs nodejs-npm
+FROM openfaas/classic-watchdog:0.14.4 as watchdog
 
-RUN apk --no-cache add curl \
-    && curl -sL https://github.com/openfaas/faas/releases/download/0.13.0/fwatchdog-armhf > /usr/bin/fwatchdog \
-    && chmod +x /usr/bin/fwatchdog
+FROM alpine:3.9
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
+
+RUN apk --update add nodejs nodejs-npm
 
 COPY package.json .
 COPY main.js .
+
 RUN npm i
+
 ENV fprocess="node main.js"
-HEALTHCHECK --interval=5s CMD [ -e /tmp/.lock ] || exit 1
 CMD ["fwatchdog"]