code: func applyPodPresetsOnContainer(ctr *api.Container, podPresets []*settingsv1alpha1.PodPreset) {
  	envVars, _ := mergeEnv(ctr.Env, podPresets)
  	ctr.Env = envVars
  
  	volumeMounts, _ := mergeVolumeMounts(ctr.VolumeMounts, podPresets)
  	ctr.VolumeMounts = volumeMounts
  
  	envFrom, _ := mergeEnvFrom(ctr.EnvFrom, podPresets)
  	ctr.EnvFrom = envFrom
  }
docs: // applyPodPresetsOnContainer injects envVars, VolumeMounts and envFrom from
  // given podPresets in to the given container. It ignores conflict errors
  // because it assumes those have been checked already by the caller.