init dockerfile

Signed-off-by: Jimmy Zelinskie <jimmy.zelinskie+git@gmail.com>

Dockerfile

@@ -0,0 +1,15 @@
+# Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+FROM golang:1.13-alpine AS build-env
+
+WORKDIR /go/src/tailscale
+COPY . .
+
+RUN go get -d -v ./cmd/...
+RUN go install -v ./cmd/...
+
+FROM alpine:3.11
+RUN apk add --no-cache ca-certificates
+COPY --from=build-env /go/bin/tail* /usr/local/bin/