@apphosting/build missing yaml dependency

[jvens]

The @apphosting/build@0.1.7 package imports yaml but does not declare it as a dependency in package.json. This causes
firebase deploy to fail with Error: Cannot find module 'yaml'.

details

In @apphosting/build/index.ts:7, there is:

import { parse as parseYaml } from "yaml";

However, @apphosting/buildpackage.json does not include yaml in its dependencies:

    "dependencies": {
        "@apphosting/common": "*",
      "@npmcli/promise-spawn": "^3.0.0",
        "colorette": "^2.0.20",
        "commander": "^11.1.0",
        "npm-pick-manifest": "^9.0.0",
        "ts-node": "^10.9.1"
    },
    "devDependencies": {
        "@types/commander": "*",
        "ts-mocha": "*",
        "ts-node": "*",
        "typescript": "*"
    }

While firebase-tools does have yaml in its own dependencies, it gets installed nested at node_modules/firebase-tools/node_modules/yaml, which @apphosting/build (installed at top-level node_modules/@apphosting/build) cannot resolve.