cloud/docker/release/trigger-upspin.yaml

{
        "description": "upspin/upspin",
        "triggerTemplate": {
                "project_id": "PROJECT_ID",
                "repo_name": "upspin",
                "branch_name": "master",
        },
        "build": {
                "steps": [
                        {
                                "name": "gcr.io/PROJECT_ID/release",
                                "args": ["upspin.io"],
                                "env": [
                                        "COMMIT_SHA=$COMMIT_SHA",
                                ],
                        },
                ],
        },
}