Render phase documents from model

Usage:
  render PHASE_NAME [flags]

Examples:

# Get all 'initinfra' phase documents containing labels "app=helm" and
# "service=tiller"
airshipctl phase render initinfra -l app=helm,service=tiller

# Get all documents containing labels "app=helm" and "service=tiller"
# and kind 'Deployment'
airshipctl phase render initinfra -l app=helm,service=tiller -k Deployment


Flags:
  -a, --annotation string   filter documents by Annotations
  -g, --apiversion string   filter documents by API version
  -h, --help                help for render
  -k, --kind string         filter documents by Kinds
  -l, --label string        filter documents by Labels