providers/oauth2: add support for OAuth 2.0 Authorization Server Metadata endpoint (RFC 8414)

[rissson]

Details

REPLACE ME

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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 92.69%. Comparing base (28d8fcc) to head (917b4ab).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12383      +/-   ##
==========================================
+ Coverage   91.32%   92.69%   +1.37%     
==========================================
  Files         767      767              
  Lines       38523    38524       +1     
==========================================
+ Hits        35180    35710     +530     
+ Misses       3343     2814     -529     

Flag	Coverage Δ
e2e	48.75% <100.00%> (+1.57%)	⬆️
integration	24.69% <0.00%> (?)
unit	90.32% <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-917b4ab392853ca4afd4e67dcbefa2f2cb01a4e9
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

For arm64, use these values:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-917b4ab392853ca4afd4e67dcbefa2f2cb01a4e9-arm64
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-917b4ab392853ca4afd4e67dcbefa2f2cb01a4e9

For arm64, use these values:

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-917b4ab392853ca4afd4e67dcbefa2f2cb01a4e9-arm64

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