universal: cloudflared mod initial release

Dockerfile

@@ -1,6 +1,34 @@
+# Build container
+FROM golang:alpine AS buildstage
+
+RUN mkdir /cloudflared
+WORKDIR /src
+
+RUN apk --no-cache add git build-base curl jq
+
+ENV GO111MODULE=on \
+    CGO_ENABLED=0
+
+RUN curl -s https://api.github.com/repos/cloudflare/cloudflared/releases/latest \
+  | jq -rc ".tag_name" \
+  | xargs -I TAG sh -c 'git -c advice.detachedHead=false clone https://github.com/cloudflare/cloudflared --depth=1 --branch TAG .'
+
+RUN GOOS=linux GOARCH=amd64 make cloudflared
+RUN mv cloudflared /cloudflared/cloudflared-amd64
+
+RUN GOOS=linux GOARCH=arm64 make cloudflared
+RUN mv cloudflared /cloudflared/cloudflared-arm64
+
+RUN GOOS=linux GOARCH=arm make cloudflared
+RUN mv cloudflared /cloudflared/cloudflared-armhf
+
+# Runtime container
 FROM scratch
+WORKDIR /
 
 LABEL maintainer="Spunkie"
 
+# copy cloudflared bins
+COPY --from=buildstage /cloudflared /cloudflared
 # copy local files
 COPY root/ /