Bump samples/versions - reduce image sizes through multi-stage builds

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

sample-functions/WebhookStash/Dockerfile

@@ -1,16 +1,26 @@
-FROM alpine:latest
+FROM golang:1.9.2-alpine as builder
 
-WORKDIR /root/
+MAINTAINER alex@openfaas.com
+ENTRYPOINT []
 
-EXPOSE 8080
-ENV http_proxy      ""
-ENV https_proxy     ""
+RUN apk --no-cache add make curl \
+    && curl -sL https://github.com/openfaas/faas/releases/download/0.6.9/fwatchdog > /usr/bin/fwatchdog \
+    && chmod +x /usr/bin/fwatchdog
 
-ADD https://github.com/openfaas/faas/releases/download/v0.5-alpha/fwatchdog /usr/bin
-RUN chmod +x /usr/bin/fwatchdog
-# COPY fwatchdog  /usr/bin/
+WORKDIR /go/src/github.com/openfaas/faas/sample-functions/WebhookStash
 
-COPY app    .
+COPY handler.go .
+# COPY vendor vendor
 
-ENV fprocess="/root/app"
-CMD ["fwatchdog"]
+RUN go install
+
+FROM alpine:3.6
+
+# Needed to reach the hub
+RUN apk --no-cache add ca-certificates 
+
+COPY --from=builder /usr/bin/fwatchdog  /usr/bin/fwatchdog
+COPY --from=builder /go/bin/WebhookStash  /usr/bin/WebhookStash
+ENV fprocess "/usr/bin/WebhookStash"
+
+CMD ["/usr/bin/fwatchdog"]

sample-functions/WebhookStash/Dockerfile.build

@@ -1,9 +0,0 @@
-FROM golang:1.7.5
-
-RUN mkdir -p /go/src/app
-COPY handler.go /go/src/app
-WORKDIR /go/src/app
-RUN go get -d -v
-RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
-
-CMD ["/bin/true"]

sample-functions/WebhookStash/build.sh

@@ -1,10 +0,0 @@
-#!/bin/sh
-echo Building functions/webhookstash:build
-
-docker build --build-arg https_proxy=$https_proxy --build-arg http_proxy=$http_proxy -t functions/webhookstash:build . -f Dockerfile.build && \
-  docker create --name hook_extract functions/webhookstash:build
-docker cp hook_extract:/go/src/app/app ./app
-docker rm -f hook_extract
-
-echo Building functions/webhookstash:latest
-docker build --no-cache -t functions/webhookstash:latest .