Initial Dockerfile commit

Dockerfile

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+FROM golang:1-alpine AS builder
+
+RUN apk add --no-cache git upx
+RUN CGO_ENBALED=0 go get -ldflags '-w' github.com/yudai/gotty
+RUN mv ${GOPATH}/bin/gotty /bin/ && \
+        upx --brute /bin/gotty
+
+FROM alpine:3.7
+
+COPY --from=builder /bin/gotty /bin/gotty
+
+ENTRYPOINT ["/bin/gotty"]