Update to support docker stack deploy

gateway/Dockerfile

@@ -1,19 +1,9 @@
-from golang:1.7.3
+FROM golang:1.7.3
 
-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
+COPY gateway    .
 
-WORKDIR /go/src/github.com/alexellis/faas/gateway
-
-COPY metrics metrics
-COPY server.go .
-
-RUN find /go/src/github.com/alexellis/faas/gateway/
-RUN go build
 EXPOSE 8080
+ENV http_proxy      ""
+ENV https_proxy     ""
 
 CMD ["./gateway"]

gateway/Dockerfile.build

@@ -0,0 +1,16 @@
+FROM golang:1.7.3
+
+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/build.sh

@@ -1,4 +1,13 @@
 #!/bin/sh
-echo Building server:latest
+echo Building alexellis2/faas-gateway:build
 
-docker build -t server . 
+docker build --build-arg https_proxy=$https_proxy --build-arg http_proxy=$http_proxy \
+    -t alexellis2/faas-gateway:build . -f Dockerfile.build
+
+docker create --name gateway_extract alexellis2/faas-gateway:build 
+docker cp gateway_extract:/go/src/github.com/alexellis/faas/gateway/app ./gateway
+docker rm -f gateway_extract
+
+echo Building alexellis2/faas-gateway:latest
+
+docker build -t alexellis2/faas-gateway:latest .