.devcontainer.json template to forward GCP Credentials into container and provide access token during container building

.devcontainer.gcp.json

{
    "name": "<your-project>",
    "build": {
	"dockerfile": "../Dockerfile",
        "args":{
            "GCLOUD_ACCESS_TOKEN": "$(gcloud auth print-access-token)"
        }
    },
    "mounts": [
        "source=${localEnv:HOME}/.config/gcloud,target=/root/.config/gcloud,type=bind"          
    ],
    "containerEnv": {
        "GOOGLE_APPLICATION_CREDENTIALS": "/root/.config/gcloud/application_default_credentials.json",
        "GCLOUD_PROJECT": "<your-project>",
    },
}