website/docs: Prioritize "Release Candidate" over "Current Release" (cherry-pick #18975 to version-2025.12)

[authentik-automation]

Cherry-pick of #18975 to version-2025.12 branch.

Original PR: #18975
Original Author: @GirlBossRush
Cherry-picked commit: 2f8dfff

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[netlify]

✅ Deploy Preview for authentik-docs ready!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.23%. Comparing base (4e0e738) to head (cac9f14).
⚠️ Report is 1 commits behind head on version-2025.12.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           version-2025.12   #19022      +/-   ##
===================================================
+ Coverage            92.52%   93.23%   +0.70%     
===================================================
  Files                  946      946              
  Lines                51967    51967              
===================================================
+ Hits                 48085    48449     +364     
+ Misses                3882     3518     -364     

Flag	Coverage Δ
e2e	44.76% <ø> (+3.19%)	⬆️
integration	23.44% <ø> (+<0.01%)	⬆️
unit	91.49% <ø> (+<0.01%)	⬆️
unit-migrate	91.54% <ø> (+<0.01%)	⬆️

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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-cac9f14439adacde07c7c96acddb00a94d935f3c
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-cac9f14439adacde07c7c96acddb00a94d935f3c

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