events: add configurable headers to webhooks

[BeryJu]

Details

closes #4875

TODO:

• API
• WebUI
• Rename webhook_mapping to webhook_mapping_body?

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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 92.76%. Comparing base (bcdc6fc) to head (4cb58c8).
Report is 10 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13602      +/-   ##
==========================================
+ Coverage   92.74%   92.76%   +0.01%     
==========================================
  Files         794      794              
  Lines       40502    40508       +6     
==========================================
+ Hits        37565    37578      +13     
+ Misses       2937     2930       -7     

Flag	Coverage Δ
e2e	48.02% <18.18%> (+0.05%)	⬆️
integration	24.30% <18.18%> (-0.01%)	⬇️
unit	90.53% <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-4cb58c8f6bb2e28464f8fc947195f7832d76bd1e
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-4cb58c8f6bb2e28464f8fc947195f7832d76bd1e

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