Build istio proxyv2 image

proxyv2_build.sh

git clone https://github.com/istio/proxy
git clone https://github.com/istio/istio


pushd istio
# Build the binary and docker first
make && make docker
# Get the command line to build proxyv2 image, this shows the artifact path for proxyv2 docker image
# say it's /golang/out/linux_amd64/release/docker_build/proxyv2
make docker.push --dry-run | grep proxyv2
popd

pushd proxy
# Build the Envoy binary, the output contains the envoy binary path in 
make
# replace the bazel output path with yours.
cp /usr/local/google/home/userfoo/.cache/bazel/_bazel_jianfeih/78021adfdd9053c17567af83bdabdf42/execroot/__main__/bazel-out/k8-fastbuild/bin/src/envoy/envoy  \
/golang/out/linux_amd64/release/docker_build/proxyv2
popd

pushd /golang/out/linux_amd64/release/docker_build/proxyv2
docker build -t gcr.io/gcp-project/proxyv2:20180620 -f Dockerfile.proxyv2 .
popd