How to create Github App for ArgoCD?

 Step 1 — Create the GitHub App

github.com → avatar → Settings → Developer settings → GitHub Apps → New GitHub App

• Name: argocd-reader (or any name)
• Homepage URL: https://github.com/Xyz-Enterprise/cdp
• Webhook: uncheck "Active" 
• Permissions → Repository permissions:
  • Contents: Read-only
  • Metadata: Read-only
• Where can this be installed: Any account
• Click Create GitHub App

Step 2 — Note the App ID

After creation, you'll see App ID at the top of the app settings page. Save it.

Step 3 — Generate a private key

Scroll down on the app settings page → Generate a private key → downloads a .pem file.

Step 4 — Install the app on the CDP repo

On the app settings page → Install App → choose Xyz-Enterprise → select Only select repositories → pick CDP → Install.

If the org blocks this, you'll see a request-sent confirmation instead — an org owner will need to approve it.

Step 5 — Get the Installation ID

After install, the URL will be: github.com/settings/installations/XXXXXXXXX

That number is your Installation ID.