2. Click on the project you want to use Packer with (or create one if you
don't have one yet).
3. Click "APIs & auth" in the left sidebar
4. Click "Registered apps" in the left sidebar
5. Click "Register App" and register a "Web Application". Choose any
name you'd like.
7. After creating the app, click "Certificate" (below the OAuth 2.0 Client
ID section), and click "Download JSON". This is your _client secrets JSON_
file. Make sure you didn't download the JSON from the "OAuth 2.0" section!
This is a common mistake and will cause the builder to not work.
8. Next, click "Generate Certificate". You should be prompted to download
a private key. Note the password for the private key! This private key
is your _client private key_.
4. Click "Credentials" in the left sidebar
5. Click "Create New Client ID" and choose "Service Account"
6. A private key will be downloaded for you. Note the password for the private key! This private key is your _client private key_.
7. After creating the account, click "Download JSON". This is your _client secrets JSON_ file. Make sure you didn't download the JSON from the "OAuth 2.0" section! This is a common mistake and will cause the builder to not work.
Finally, one last step, you'll have to convert the `p12` file you
got from Google into the PEM format. You can do this with OpenSSL, which
