Add OIDC ID extraction guidance for IRSA setup

[Copilot]

The IRSA setup instructions referenced "the OIDC ID from step 1" without explaining that it's the unique identifier at the end of the OIDC issuer URL.

Changes

• Added clarification note in step 3 explaining OIDC ID extraction from issuer URL
• Included concrete example showing URL format and ID location

Example

When step 1 returns:

https://oidc.eks.us-west-2.amazonaws.com/id/EXAMPLED539D4633E53DE1B71EXAMPLE

The OIDC ID is: EXAMPLED539D4633E53DE1B71EXAMPLE

Screenshot

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/percona/pbm-docs/commits
  • Triggering command: /usr/bin/python3 /home/REDACTED/.local/bin/mkdocs build --strict (http block)
  • Triggering command: /usr/bin/python3 /home/REDACTED/.local/bin/mkdocs build (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[radoslawszulgo]

LGTM