Add Dockerfile

Dockerfile

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+FROM debian
+
+RUN mkdir /go
+COPY knockr.go /go/knockr.go
+
+RUN apt-get update && apt-get install -y git golang-go
+RUN GOPATH=/go go get github.com/mkideal/cli
+
+ENV destination=
+ENV gatewayport=80
+ENV whitelistport=8080
+ENV timeout=600
+
+WORKDIR /go
+CMD GOPATH=/go go run knockr.go --Destination ${destination} --WhitelistPort ${whitelistport} --GatewayPort ${gatewayport} --Timeout ${timeout}