Add guidance to create GCP projects under "No organization" scope (#530)

* Initial plan

* Add advice to create GCP projects under 'No organization' scope

Co-authored-by: SkafteNicki <24896311+SkafteNicki@users.noreply.github.com>

* remove second note

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: SkafteNicki <24896311+SkafteNicki@users.noreply.github.com>
Co-authored-by: Nicki Skafte <skaftenicki@gmail.com>

Author: Copilot

s6_the_cloud/cloud_setup.md

@@ -60,6 +60,16 @@ As the first step, we are going to get you some Google Cloud credits.
     is being created. The notification bell is a good way to make sure how the processes you are running are doing
     throughout the course.
 
+    !!! warning "Create project under 'No organization'"
+
+        When creating your GCP project, make sure to select **"No organization"** from the organization dropdown menu.
+        Many organization-managed accounts (including universities and Google Workspace accounts) enforce security
+        policies that disable the creation of JSON service account keys by default. This is done through the
+        `iam.disableServiceAccountKeyCreation` organization policy. If you create your project under an organization,
+        you may run into issues later when trying to create service account keys, which are needed for authenticating
+        services like GitHub Actions with GCP. Creating your project under "No organization" avoids these restrictions
+        while you are learning.
+
 5. Next is local setup on your laptop. We are going to install `gcloud`, which is part of the Google Cloud SDK.
     `gcloud` is the command line interface for working with our Google Cloud account. Nearly everything that we can do
     through the web interface we can also do through the `gcloud` interface. Follow the installation instructions