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How to authenticate gcloud-cli using a service account

This applies to such use cases where using a personal account is not an option. For example to run a cronjob in a remote server.

1. Create a service account and download its key file. Assume my-account@my-project.iam.gserviceaccount.com is the service account email and my-account-key.json is the key file for this example.
2. Assign appropriate roles to the account.
3. Activate the service account in gcloud config;

   gcloud auth activate-service-account --key-file=my-account-key.json
   

4. Select the service account;

   gcloud config set account my-account@my-project.iam.gserviceaccount.com