Update Dockerfile for ARM64

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

gateway/Dockerfile.arm64

@@ -1,10 +1,14 @@
 FROM golang:1.10.4 as build
-WORKDIR /go/src/github.com/openfaas/faas/gateway
+ARG GIT_COMMIT_SHA
+ARG GIT_COMMIT_MESSAGE
+ARG VERSION='dev'
 
 RUN curl -sLSf \
   https://raw.githubusercontent.com/teamserverless/license-check/master/get.sh | sh \
   && mv ./license-check /usr/bin/
 
+WORKDIR /go/src/github.com/openfaas/faas/gateway
+
 COPY vendor         vendor
 
 COPY handlers       handlers
@@ -20,11 +24,24 @@ COPY scaling        scaling
 COPY server.go      .
 
 # Run a gofmt and exclude all vendored code.
-RUN license-check -path ./ --verbose=false \
+RUN license-check -path ./ --verbose=false "Alex Ellis" "OpenFaaS Project" "OpenFaaS Authors" "OpenFaaS Author(s)" \
-RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gateway .
+    && test -z "$(gofmt -l $(find . -type f -name '*.go' -not -path "./vendor/*"))" \
+    && go test $(go list ./... | grep -v integration | grep -v /vendor/ | grep -v /template/) -cover \
+    && CGO_ENABLED=0 GOOS=linux go build --ldflags "-s -w \
+    -X github.com/openfaas/faas/gateway/version.GitCommitSHA=${GIT_COMMIT_SHA}\
+    -X \"github.com/openfaas/faas/gateway/version.GitCommitMessage=${GIT_COMMIT_MESSAGE}\"\
+    -X github.com/openfaas/faas/gateway/version.Version=${VERSION}" \
+    -a -installsuffix cgo -o gateway .
 
 FROM alpine:3.9
 
+LABEL org.label-schema.license="MIT" \
+    org.label-schema.vcs-url="https://github.com/openfaas/faas" \
+    org.label-schema.vcs-type="Git" \
+    org.label-schema.name="openfaas/faas" \
+    org.label-schema.vendor="openfaas" \
+    org.label-schema.docker.schema-version="1.0"
+
 RUN addgroup -S app \
     && adduser -S -g app app \
     && apk add --no-cache ca-certificates