Support deploy GAE

cloudbuild/app-engine.yaml

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+steps:
+  - name: node:16-bullseye
+    entrypoint: npm
+    args: ['install']
+
+  - name: node:16-bullseye
+    entrypoint: npm
+    args: ['run', 'lint', '${_SERVICE_NAME}']
+
+  - name: node:16-bullseye
+    entrypoint: npm
+    args: ['run', 'test', '${_SERVICE_NAME}']
+
+  - name: node:16-bullseye
+    entrypoint: npm
+    args:
+      ['run', 'build', '${_SERVICE_NAME}', '--', '--configuration=production']
+
+  - name: node:16-bullseye
+    entrypoint: bash
+    args:
+      [
+        '-c',
+        'node tools/prepare-gcp-app-engine.js --serviceName=${_SERVICE_NAME}',
+      ]
+
+  - name: gcr.io/google.com/cloudsdktool/cloud-sdk:376.0.0-slim
+    dir: dist/apps/${_SERVICE_NAME}
+    entrypoint: gcloud
+    args:
+      - app
+      - deploy
+      - app-engine.yaml
+      - --version=$SHORT_SHA
+      - --promote
+      - --stop-previous-version
+      - --quiet
+
+substitutions:
+  _SERVICE_NAME: game-api

tools/prepare-gcp-app-engine.js

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+const fs = require('fs');
+const path = require('path');
+const yargs = require('yargs/yargs');
+console.log('Prepare GCP App Engine: ', new Date().toISOString());
+
+const { serviceName } = yargs(process.argv).argv;
+if (!serviceName) {
+  console.error('Missing serviceName args. Eg: --serviceName=explore-api');
+  process.exit(1);
+}
+
+const PACKAGE_PATH = path.join('dist', 'apps', serviceName, 'package.json');
+
+function main() {
+  const packageJson = fs.readFileSync(PACKAGE_PATH).toString();
+  const scripts = {
+    start: 'node main.js',
+  };
+
+  const newPackageJson = {
+    ...JSON.parse(packageJson),
+    scripts,
+  };
+
+  fs.writeFileSync(PACKAGE_PATH, JSON.stringify(newPackageJson, null, 2));
+
+  console.log(
+    'Updated package.json: ',
+    fs.readFileSync(PACKAGE_PATH).toString()
+  );
+}
+
+main();