Google Cloud Ephemeral Configuration File Definition
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The GCP Bootstrap container creates an Ephemeral K8S cluster on the Google Cloud platform.
The container requires authentication credentials and other information about the cluster to deploy.
It requires a YAML configuration file with the format provided below.

<YAML>
apiVersion: v1
kind: GoogleCloudConfig
metadata:
    name: <Ephemeral K8S cluster name>
credentials:
    project: <Google Cloud Project ID>
    account: <Google Cloud Account ID>
    credential: <credentials.json filename>
spec:
    region: <Google Cloud Region, e.g., us-central1>
    Zone: <Google Cloud Zone, e.g., us-central1-c>
    cluster:
        k8sVersion: <Kubernetes version, e.g., 1.16.9-gke.6>
        machineSize: <Google Cloud Compute VM Type, e.g., e2-medium>
        diskSize: <Google Cloud compute disk size>
        replicas: <Node Replica Number for the cluster>
        kubeconfig: <Kubeconfig filename, Default is 'kubeconfig'>
</YMAL>

The JSON format is also a valid configuration file for this bootstrap container.

<JSON>
{
    "apiVersion": "v1",
    "kind": "GoogleCloudConfig",
    "metadata": {
       "name": "<Ephemeral K8S cluster name>"
    },
    "credentials": {
       "project": "<Google Cloud Project ID>",
       "account": "<Google Cloud Account ID>",
       "credential": "<credentials.json filename>"
    },
    "spec": {
       "region": "<Google Cloud Region, e.g., us-central1>",
       "zone": "<Google Cloud Compute VM Type, e.g., e2-medium>",
       "cluster": {
          "k8sVersion": "<Kubernetes version, e.g., 1.16.9-gke.6>",
          "machineSize": "<Google Cloud Compute VM Type, e.g., e2-medium>",
          "diskSize": <Google Cloud compute disk size>,
          "replicas": <Node Replica Number for the cluster>,
          "kubeconfig": "<Kubeconfig filename, Default is 'kubeconfig'>"
       }
    }
 }
 </JSON>

The expected location for the GCP bootstrap configuration file is dictated by the "volume" mount
specified in the Airship config file (bootstrapInfo.ephemeral.container.volume).
For example, /home/esidshi/.airship folder as shown in the snippet below:

<Snippet>
apiVersion: airshipit.org/v1alpha1
bootstrapInfo:
  ephemeral:
    container:
      volume: /home/esidshi/.airship:/kube
</Snippet>