website/docs: document cross-provider token introspection

[dominic-r]

https://www.notion.so/authentiksecurity/Docs-for-release-2026-5-359aee05b24e80d2a369f0cac24cc5b5?source=copy_link#359aee05b24e807884bde35c03e202b6

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.25%. Comparing base (e5ad2d1) to head (8b65a33).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #22142   +/-   ##
=======================================
  Coverage   93.25%   93.25%           
=======================================
  Files        1027     1027           
  Lines       59598    59598           
  Branches      400      400           
=======================================
  Hits        55576    55576           
  Misses       4022     4022           

Flag	Coverage Δ
conformance	36.75% <ø> (+<0.01%)	⬆️
e2e	41.99% <ø> (+0.01%)	⬆️
integration	33.16% <ø> (+<0.01%)	⬆️
rust	0.00% <ø> (ø)
unit	92.18% <ø> (ø)
unit-migrate	92.19% <ø> (-0.02%)	⬇️

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[github-actions]

authentik PR Installation instructions

Instructions for docker-compose

Add the following block to your .env file:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-8b65a3347efb536f8c98cacc0db2011e5f59da82
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

Afterwards, run the upgrade commands from the latest release notes.

Instructions for Kubernetes

Add the following block to your values.yml file:

authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-8b65a3347efb536f8c98cacc0db2011e5f59da82

Afterwards, run the upgrade commands from the latest release notes.

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[tanberry]

Looks great to me, thanks @dominic-r.