Add pwgen and bump Alpine base image

Alpine Base image goes to 3.7 (latest)

pwgen sample added.

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

sample-functions/AlpineFunction/Dockerfile

@@ -1,6 +1,7 @@
-FROM alpine:3.6
+FROM alpine:3.7
 
 ADD https://github.com/openfaas/faas/releases/download/0.7.9/fwatchdog /usr/bin
+
 # COPY ./fwatchdog /usr/bin/
 RUN chmod +x /usr/bin/fwatchdog
 

sample-functions/AlpineFunction/Dockerfile.armhf

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 
 ADD https://github.com/openfaas/faas/releases/download/0.7.9/fwatchdog-armhf /usr/bin/fwatchdog
 RUN chmod +x /usr/bin/fwatchdog

sample-functions/pwgen/Dockerfile

@@ -0,0 +1,5 @@
+FROM functions/alpine:latest
+	
+RUN apk add --no-cache pwgen
+
+ENV fprocess="xargs pwgen -s"

sample-functions/pwgen/README.md

@@ -0,0 +1,10 @@
+pwgen
+-----
+
+The password generation utility from Alpine Linux, but as a function.
+
+Man page:
+
+https://linux.die.net/man/1/pwgen
+
+

sample-functions/stack.yml

@@ -10,6 +10,11 @@ functions:
     environment:
       fprocess: "cat"
 
+  pwgen:
+    lang: dockerfile
+    handler: ./pwgen
+    image: functions/pwgen-sample:latest
+
   apikey-secret:
     lang: go
     handler: ./apikey-secret