add-iam-pubsub.md

In order to add a new IAM service account to publish on PubSub and download its key, we must:

1. Create a new IAM service account
2. Give it PubSub Editor role

Creating a new IAM service account:

To create a new IAM service account, simply follow the instructions provided here: https://cloud.google.com/iam/docs/creating-managing-service-accounts#creating

Giving it a PubSub Editor role:

To do that, simply navigate to your topic here: https://console.cloud.google.com/cloudpubsub/topic/, select it and add the PubSub Editor Permission to your service account. The PubSub Editor role is restrained to this Topic.

Download its key:

Follow the instructions: https://cloud.google.com/iam/docs/creating-managing-service-account-keys#creating