Bump files to use alpine:3.8

Bump Dockerfiles and mentions of alpine 3.7 to be now
3.8

Signed-off-by: Martin Dekov (VMware) <mdekov@vmware.com>

contrib/alertmanager-arm64/v0.15.0/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 WORKDIR /root
 RUN apk add --update libarchive-tools
 ADD https://github.com/prometheus/alertmanager/releases/download/v0.15.0/alertmanager-0.15.0.linux-arm64.tar.gz /root/

contrib/alertmanager-armhf/0.15.0/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 WORKDIR /root
 RUN apk add --update libarchive-tools
 ADD https://github.com/prometheus/alertmanager/releases/download/v0.15.0/alertmanager-0.15.0.linux-armv7.tar.gz /root/

contrib/prometheus-arm64/2.3/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 WORKDIR /root/
 
 RUN apk add --update libarchive-tools curl \

contrib/prometheus-armhf/2.2/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 WORKDIR /root/
 
 RUN apk add --update libarchive-tools curl \

gateway/Dockerfile

@@ -33,7 +33,7 @@ RUN license-check -path ./ --verbose=false "Alex Ellis" "OpenFaaS Project" "Open
     -X github.com/openfaas/faas/gateway/version.Version=${VERSION}" \
     -a -installsuffix cgo -o gateway .
 
-FROM alpine:3.7
+FROM alpine:3.8
 
 LABEL org.label-schema.license="MIT" \
     org.label-schema.vcs-url="https://github.com/openfaas/faas" \

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:3.7
+FROM alpine:3.8
 
 RUN addgroup -S app \
     && adduser -S -g app app

gateway/Dockerfile.armhf

@@ -18,7 +18,7 @@ COPY server.go      .
 
 RUN GOARM=7 CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gateway .
 
-FROM alpine:3.7
+FROM alpine:3.8
 WORKDIR /root/
 
 EXPOSE 8080

guide/deployment_swarm_arm.md

@@ -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:3.7
+ Step 1/16 : FROM alpine:3.8
   ---> 16566b7ed19e
 ...
 

sample-functions/AlpineFunction/Dockerfile.arm64

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 
 RUN apk --no-cache add curl \
     && curl -sL https://github.com/openfaas/faas/releases/download/0.9.6/fwatchdog-arm64 > /usr/bin/fwatchdog \

sample-functions/ApiKeyProtected-Secrets/Dockerfile

@@ -14,7 +14,7 @@ COPY handler.go .
 
 RUN go install
 
-FROM alpine:3.7
+FROM alpine:3.8
 
 # Needed to reach the hub
 RUN apk --no-cache add ca-certificates 

sample-functions/CHelloWorld/src/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7 as builder
+FROM alpine:3.8 as builder
 RUN apk add --no-cache curl \
     && curl -SL https://github.com/openfaas/faas/releases/download/0.9.6/fwatchdog > /usr/bin/fwatchdog \
     && chmod +x /usr/bin/fwatchdog \

sample-functions/CaptainsIntent/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 RUN apk --update add nodejs nodejs-npm
 
 RUN apk --no-cache add curl \

sample-functions/ChangeColorIntent/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 RUN apk --update add nodejs nodejs-npm
 
 RUN apk --no-cache add curl \

sample-functions/DockerHubStats/Dockerfile

@@ -13,7 +13,7 @@ COPY . /go/src/github.com/openfaas/faas/sample-functions/DockerHubStats
 
 RUN make install
 
-FROM alpine:3.7
+FROM alpine:3.8
 
 # 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:3.7
+FROM alpine:3.8
 
 # Needed to reach the hub
 RUN apk --no-cache add ca-certificates 

sample-functions/HostnameIntent/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 RUN apk --update add nodejs nodejs-npm
 
 RUN apk --no-cache add curl \

sample-functions/MarkdownRender/Dockerfile

@@ -14,7 +14,7 @@ COPY vendor vendor
 
 RUN go install
 
-FROM alpine:3.7
+FROM alpine:3.8
 
 # Needed to reach the hub
 RUN apk --no-cache add ca-certificates 

sample-functions/NodeInfo/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 
 RUN apk --update add nodejs nodejs-npm
 

sample-functions/NodeInfo/Dockerfile.arm64

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 
 RUN apk --update add nodejs nodejs-npm
 

sample-functions/NodeInfo/Dockerfile.armhf

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 RUN apk --no-cache add nodejs nodejs-npm
 
 RUN apk --no-cache add curl \

sample-functions/ResizeImageMagick/Dockerfile.armhf

@@ -1,4 +1,4 @@
-FROM arm32v6/alpine:3.7
+FROM arm32v6/alpine:3.8
 
 RUN apk --no-cache add imagemagick
 

sample-functions/WebhookStash/Dockerfile

@@ -14,7 +14,7 @@ COPY handler.go .
 
 RUN go install
 
-FROM alpine:3.7
+FROM alpine:3.8
 
 # Needed to reach the hub
 RUN apk --no-cache add ca-certificates 

sample-functions/figlet/Dockerfile.armhf

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 
 RUN apk --no-cache add curl \
     && curl -sL https://github.com/openfaas/faas/releases/download/0.9.6/fwatchdog-armhf > /usr/bin/fwatchdog \

sample-functions/gif-maker/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 
 RUN apk --no-cache add ffmpeg gifsicle curl \
     && curl -LS https://github.com/openfaas/faas/releases/download/0.9.6/fwatchdog > /usr/bin/fwatchdog \