if [ "${ISTIO_VERSION}" = "" ] ; then
  ISTIO_VERSION="$(curl -sL https://github.com/istio/istio/releases | \
                  grep -o 'releases/[0-9]*.[0-9]*.[0-9]*/' | sort -V | \
                  tail -1 | awk -F'/' '{ print $2}')"
  ISTIO_VERSION="${ISTIO_VERSION##*/}"
fi

if [ "${ISTIO_VERSION}" = "" ] ; then

# hadolint ignore=DL3006
FROM ${BASE_DISTRIBUTION:-debug}

WORKDIR /

ARG istio_version

# Install ztunnel.
ARG TARGETARCH
COPY ${TARGETARCH:-amd64}/ztunnel /usr/local/bin/ztunnel

# Environment variable indicating the exact build, for debugging
ENV ISTIO_META_ISTIO_VERSION $istio_version