build(docs-infra): print the git commit when deploying to Firebase (#39596)

The commit updates the AIO deployment script to also print the commit
SHA. This makes it easier to check whether a version has been
successfully deployed, by comparing the commit SHA from the CI job with
the SHA in the version string in the footer of the AIO app.

PR Close #39596

aio/scripts/deploy-to-firebase.js

@@ -31,6 +31,7 @@ if (require.main === module) {
   } else {
     console.log(
         `Git branch        : ${inputVars.currentBranch}\n` +
+        `Git commit        : ${inputVars.currentCommit}\n` +
         `Build/deploy mode : ${deploymentInfo.deployEnv}\n` +
         `Firebase project  : ${deploymentInfo.projectId}\n` +
         `Firebase site     : ${deploymentInfo.siteId}\n` +

aio/scripts/deploy-to-firebase.spec.js

@@ -262,17 +262,19 @@ describe('deploy-to-firebase:', () => {
   });
 
   it('integration - should run the main script without error', () => {
+    const commit = getLatestCommit('master');
     const cmd = `"${process.execPath}" "${__dirname}/deploy-to-firebase" --dry-run`;
     const env = {
       CI_REPO_OWNER: 'angular',
       CI_REPO_NAME: 'angular',
       CI_PULL_REQUEST: 'false',
       CI_BRANCH: 'master',
-      CI_COMMIT: getLatestCommit('master')
+      CI_COMMIT: commit,
     };
     const result = execSync(cmd, {encoding: 'utf8', env}).trim();
     expect(result).toBe(
         'Git branch        : master\n' +
+        `Git commit        : ${commit}\n` +
         'Build/deploy mode : next\n' +
         'Firebase project  : angular-io\n' +
         'Firebase site     : next-angular-io-site\n' +