function export_vars_for_environment {  local environment=$1  local env_file="crates/collab/k8s/environments/${environment}.sh"  if [[ ! -f $env_file ]]; then    echo "Invalid environment name '${environment}'" >&2    exit 1  fi  export $(cat $env_file)} function image_id_for_version {  local version=$1   # Check that version is valid  if [[ ! ${version} =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then    echo "Invalid version number '${version}'" >&2    exit 1  fi   # Check that image exists for version  tag_names=$(doctl registry repository list-tags collab --no-header --format Tag)  if ! $(echo "${tag_names}" | grep -Fqx v${version}); then    echo "No docker image tagged for version '${version}'" >&2    echo "Found images with these tags:" ${tag_names} >&2    exit 1  fi    echo "registry.digitalocean.com/zed/collab:v${version}"} function version_for_image_id {  local image_id=$1  echo $image_id | cut -d: -f2} function target_zed_kube_cluster {  if [[ $(kubectl config current-context 2> /dev/null) != do-nyc1-zed-1 ]]; then    doctl kubernetes cluster kubeconfig save zed-1  fi}