DSPX-3636 update quickstart Keycloak docs

[jp-ayyappan]

Summary

• update the getting started Docker Compose Keycloak image to 26.2
• switch the docs quickstart compose file to KC_BOOTSTRAP_ADMIN_* variables
• remove the deprecated preview token-exchange feature flag from the docs quickstart Keycloak service

Context

Part of DSPX-3636. This mirrors the Keycloak 26 / standard token exchange work in opentdf/platform#3754.

Testing

• not run; docs compose YAML-only change

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Review details

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between afd1149 and aa73f9f.

📒 Files selected for processing (1)

• docs/getting-started/docker-compose.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch DSPX-3636-standard-token-exchange-docs

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[gemini-code-assist]

Code Review

This pull request updates the Keycloak service in the Docker Compose configuration from version 25.0 to 26.2, updating the admin environment variables and removing the KC_FEATURES setting. Feedback highlights that upgrading to Keycloak 26.2 requires replacing the deprecated KC_PROXY: edge environment variable with KC_PROXY_HEADERS: x-forwarded to prevent startup configuration errors.

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[gemini-code-assist]

With the upgrade to Keycloak 26.2, the deprecated KC_PROXY environment variable has been completely removed. Keeping KC_PROXY: edge (on line 100) will cause Keycloak to fail to start with a configuration error. Please replace KC_PROXY: edge with KC_PROXY_HEADERS: x-forwarded on line 100 to align with the new configuration options in Keycloak 26.

[github-actions]

📄 Preview deployed to https://opentdf-docs-pr-364.surge.sh