Add a check for cluster autoscaler in find-updates

[surajssd]

Add following code snippet to the script in the components section:

###########################
# Cluster autoscaler
cd "${workdir}"
current_version=$(grep appVersion ./assets/components/cluster-autoscaler/Chart.yaml | cut -d":" -f2 | sed 's/ //g')

tmpdir=$(mktemp -d)
cd "${tmpdir}"

helm repo add autoscaler https://kubernetes.github.io/autoscaler >/dev/null 2>&1
helm repo update >/dev/null 2>&1
helm fetch --untar --untardir ./ autoscaler/cluster-autoscaler
version=$(grep appVersion "${tmpdir}/cluster-autoscaler/Chart.yaml" | cut -d":" -f2 | sed 's/ //g')

printf "${format}" "cluster-autoscaler" "${current_version}" "${version}"
rm -rf "${tmpdir}"

Before adding make sure that following command works without error. Right now it errors like this:

$ helm repo add autoscaler https://kubernetes.github.io/autoscaler
Error: looks like "https://kubernetes.github.io/autoscaler" is not a valid chart repository or cannot be reached: failed to fetch https://kubernetes.github.io/autoscaler/index.yaml : 404 Not Found

More info in the upstream: kubernetes/autoscaler#3398.