Update alpine version to 3.7

This updates alpine version to 3.7 in sample-functions, gateway
and some markdown docas.

Signed-off-by: Ivana Yovcheva (VMware) <iyovcheva@vmware.com>

gateway/Dockerfile

@@ -25,7 +25,7 @@ RUN license-check -path ./ --verbose=false "Alex Ellis" "OpenFaaS Project" \
     && go test $(go list ./... | grep -v integration | grep -v /vendor/ | grep -v /template/) -cover \
     && CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gateway .
 
-FROM alpine:3.6
+FROM alpine:3.7
 
 RUN addgroup -S app \
     && adduser -S -g app app

gateway/Dockerfile.arm64

@@ -20,7 +20,7 @@ COPY server.go      .
 #RUN license-check -path ./ --verbose=false \
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gateway .
 
-FROM alpine:3.6
+FROM alpine:3.7
 
 RUN addgroup -S app \
     && adduser -S -g app app

gateway/Dockerfile.armhf

@@ -15,7 +15,7 @@ COPY server.go      .
 
 RUN GOARM=7 CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gateway .
 
-FROM alpine:3.6
+FROM alpine:3.7
 WORKDIR /root/
 
 EXPOSE 8080

gateway/vendor/github.com/openfaas/nats-queue-worker/queue-worker/Dockerfile

@@ -6,7 +6,7 @@ COPY main.go  .
 
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
 
-FROM alpine:3.6
+FROM alpine:3.7
 RUN apk add --no-cache ca-certificates
 WORKDIR /root/
 

gateway/vendor/github.com/openfaas/nats-queue-worker/queue-worker/Dockerfile.armhf

@@ -6,7 +6,7 @@ COPY main.go  .
 
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
 
-FROM alpine:3.6
+FROM alpine:3.7
 RUN apk add --no-cache ca-certificates
 WORKDIR /root/
 

guide/deployment_swarm_arm.md

@@ -22,7 +22,7 @@ The function watchdog is cross-compiled through our CI process on a 64-bit PC.
 
 **Functions on armhf**
 
-When running OpenFaaS on ARM a key consideration is that we need to use ARM base Docker images for our functions. This typically means swapping out the `FROM` instruction and the function code can stay the same, but more of the official base images are becoming multi-architecture (e.g. `apline:3.6`) which means that the build stage will pull the appropriate image for the hardware performing the build.
+When running OpenFaaS on ARM a key consideration is that we need to use ARM base Docker images for our functions. This typically means swapping out the `FROM` instruction and the function code can stay the same, but more of the official base images are becoming multi-architecture (e.g. `apline:3.7`) which means that the build stage will pull the appropriate image for the hardware performing the build.
 
 ### Initialize Swarm Mode
 
@@ -142,7 +142,7 @@ $ faas-cli build -f callme.yml
  Building: alexellis/callme:armhf with node template. Please wait..
  docker build -t alexellis/callme:armhf .
  Sending build context to Docker daemon  8.704kB
- Step 1/16 : FROM alpine:3.6
+ Step 1/16 : FROM alpine:3.7
   ---> 16566b7ed19e
 ...
 

sample-functions/AlpineFunction/Dockerfile.arm64

@@ -1,4 +1,4 @@
-FROM arm64v8/alpine:3.6
+FROM arm64v8/alpine:3.7
 
 ADD https://github.com/alexellis/faas/releases/download/0.8.0/fwatchdog-arm64 /usr/bin/fwatchdog
 # COPY ./fwatchdog /usr/bin/

sample-functions/ApiKeyProtected-Secrets/Dockerfile

@@ -14,7 +14,7 @@ COPY handler.go .
 
 RUN go install
 
-FROM alpine:3.6
+FROM alpine:3.7
 
 # Needed to reach the hub
 RUN apk --no-cache add ca-certificates 

sample-functions/CHelloWorld/src/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.6 as builder
+FROM alpine:3.7 as builder
 RUN apk add --no-cache curl \
     && curl -SL https://github.com/openfaas/faas/releases/download/0.8.0/fwatchdog > /usr/bin/fwatchdog \
     && chmod +x /usr/bin/fwatchdog \

sample-functions/CaptainsIntent/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 RUN apk --update add nodejs nodejs-npm
 
 ADD https://github.com/openfaas/faas/releases/download/0.8.0/fwatchdog /usr/bin

sample-functions/ChangeColorIntent/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 RUN apk --update add nodejs nodejs-npm
 
 ADD https://github.com/openfaas/faas/releases/download/0.8.0/fwatchdog /usr/bin

sample-functions/DockerHubStats/Dockerfile

@@ -13,7 +13,7 @@ COPY . /go/src/github.com/openfaas/faas/sample-functions/DockerHubStats
 
 RUN make install
 
-FROM alpine:3.6
+FROM alpine:3.7
 
 # Needed to reach the hub
 RUN apk --no-cache add ca-certificates 

sample-functions/DockerHubStats/Dockerfile.armhf

@@ -13,7 +13,7 @@ COPY . /go/src/github.com/openfaas/faas/sample-functions/DockerHubStats
 
 RUN make install
 
-FROM alpine:3.6
+FROM alpine:3.7
 
 # Needed to reach the hub
 RUN apk --no-cache add ca-certificates 

sample-functions/HostnameIntent/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 RUN apk --update add nodejs nodejs-npm
 
 ADD https://github.com/openfaas/faas/releases/download/0.8.0/fwatchdog /usr/bin

sample-functions/MarkdownRender/Dockerfile

@@ -14,7 +14,7 @@ COPY vendor vendor
 
 RUN go install
 
-FROM alpine:3.6
+FROM alpine:3.7
 
 # Needed to reach the hub
 RUN apk --no-cache add ca-certificates 

sample-functions/NodeInfo/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 
 RUN apk --update add nodejs nodejs-npm
 

sample-functions/NodeInfo/Dockerfile.arm64

@@ -1,4 +1,4 @@
-FROM arm64v8/alpine:3.6
+FROM arm64v8/alpine:3.7
 
 RUN apk --update add nodejs nodejs-npm
 

sample-functions/NodeInfo/Dockerfile.armhf

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 RUN apk --no-cache add nodejs nodejs-npm
 
 ADD https://github.com/openfaas/faas/releases/download/0.8.0/fwatchdog-armhf /usr/bin/fwatchdog

sample-functions/ResizeImageMagick/Dockerfile.armhf

@@ -1,4 +1,4 @@
-FROM arm32v6/alpine:3.6
+FROM arm32v6/alpine:3.7
 
 RUN apk --no-cache add imagemagick
 

sample-functions/WebhookStash/Dockerfile

@@ -14,7 +14,7 @@ COPY handler.go .
 
 RUN go install
 
-FROM alpine:3.6
+FROM alpine:3.7
 
 # Needed to reach the hub
 RUN apk --no-cache add ca-certificates 

sample-functions/figlet/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 
 ADD https://github.com/openfaas/faas/releases/download/0.8.0/fwatchdog /usr/bin
 RUN chmod +x /usr/bin/fwatchdog

sample-functions/figlet/Dockerfile.armhf

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 
 ADD https://github.com/openfaas/faas/releases/download/0.8.0/fwatchdog-armhf /usr/bin/fwatchdog
 RUN chmod +x /usr/bin/fwatchdog

sample-functions/gif-maker/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 
 RUN apk --no-cache add ffmpeg gifsicle curl \
    && curl -LS https://github.com/openfaas/faas/releases/download/0.8.0/fwatchdog > /usr/bin/fwatchdog \

watchdog/README.md

@@ -34,7 +34,7 @@ Here's how to package your function if you don't want to use the CLI or have exi
 Example Dockerfile for an `echo` function:
 
 ```
-FROM alpine:3.5
+FROM alpine:3.7
 
 ADD https://github.com/openfaas/faas/releases/download/0.8.0/fwatchdog /usr/bin
 RUN chmod +x /usr/bin/fwatchdog