Initial work for ARMHF

gateway/Dockerfile.build.armhf

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+FROM alexellis2/go-armhf:1.7.4
+
+RUN go get -d github.com/docker/docker/api/types \
+   && go get -d github.com/docker/docker/api/types/filters \
+   && go get -d github.com/docker/docker/api/types/swarm \
+   && go get -d github.com/docker/docker/client \
+   && go get github.com/gorilla/mux \
+   && go get github.com/prometheus/client_golang/prometheus
+
+WORKDIR /go/src/github.com/alexellis/faas/gateway
+
+COPY metrics metrics
+COPY server.go .
+
+RUN find /go/src/github.com/alexellis/faas/gateway/
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .

gateway/armhf.build.sh

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+#!/bin/sh
+echo Building alexellis2/faas-gateway:build-armhf
+
+docker build --build-arg https_proxy=$https_proxy --build-arg http_proxy=$http_proxy \
+    -t alexellis2/faas-gateway:build-armhf . -f Dockerfile.build.armhf
+
+docker create --name gateway_extract alexellis2/faas-gateway:build-armhf echo
+docker cp gateway_extract:/go/src/github.com/alexellis/faas/gateway/app ./gateway
+docker rm -f gateway_extract
+
+echo Building alexellis2/faas-gateway:latest-armhf
+
+docker build -t alexellis2/faas-gateway:latest-armhf .