stages/email: Fix email stage serialization

[melizeche]

Details

Fixed a serialization error in the email stage that occurred when trying to pass Django model classes through Celery tasks. The error manifested as kombu.exceptions.EncodeError: Object of type ModelBase is not JSON serializable.

closes #13232

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.71%. Comparing base (a22b558) to head (ab1c1c9).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13256   +/-   ##
=======================================
  Coverage   92.70%   92.71%           
=======================================
  Files         792      793    +1     
  Lines       40234    40268   +34     
=======================================
+ Hits        37300    37334   +34     
  Misses       2934     2934           

Flag	Coverage Δ
e2e	48.07% <13.15%> (-0.04%)	⬇️
integration	24.11% <2.63%> (-0.02%)	⬇️
unit	90.43% <100.00%> (+<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-ab1c1c9e059cee3c34e132767e8256669bbf7a4f
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-ab1c1c9e059cee3c34e132767e8256669bbf7a4f

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

[notion-workspace]

Fix Email sending serialization bug

[rissson]

/cherry-pick version-2025.2