Adds Dockerfile for Go

tools/dockerfile/grpc_go/Dockerfile

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+# Dockerfile for gRPC Go
+FROM golang:1.4
+
+# Install SSH to that Go source can be pulled securely.
+RUN apt-get update && apt-get install -y ssh
+
+# Install a GitHub SSH service credential that gives access to the GitHub repo while it's private
+#
+# TODO: remove this once the repo is public
+ADD .ssh .ssh
+RUN chmod 600 /.ssh/github.rsa
+RUN mkdir -p $HOME/.ssh && echo 'Host github.com' > $HOME/.ssh/config
+RUN echo "    IdentityFile /.ssh/github.rsa" >> $HOME/.ssh/config
+RUN echo 'StrictHostKeyChecking no' >> $HOME/.ssh/config
+
+# Force go get to use the GitHub ssh url instead of https, and use the SSH creds
+RUN git config --global url."git@github.com:".insteadOf "https://github.com/"
+
+# Get the source from GitHub
+RUN go get github.com/google/grpc-go
+
+# Build the interop client and server
+RUN cd src/github.com/google/grpc-go/interop/client && go install
+RUN cd src/github.com/google/grpc-go/interop/server && go install
+
+# Specify the default command such that the interop server runs on its known testing port
+CMD ["/bin/bash", "-c 'cd src/github.com/google/grpc-go/interop/server && go run server.go --use_tls=true --port=8020'"]

tools/dockerfile/grpc_go/README.md

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+GRPC Go Dockerfile
+==================
+
+Dockerfile for gRPC Go development, testing and deployment.