website/integrations: add certificate instructions to apache guacamole

[dewi-tik]

Details

Adds a section to the Apache Guacamole integration document to explain the use of self signed certificates.

Closes #13671

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Inapplicable

## 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)

[dewi-tik]

Needs:

• to be modified to match new document template
• tested

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[dewi-tik]

Thank you for the suggestion @cheggerdev

Does this modified document match your experiences? Are there any further details that you think I should add?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.74%. Comparing base (d3172ae) to head (188f9f4).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13684      +/-   ##
==========================================
+ Coverage   92.70%   92.74%   +0.03%     
==========================================
  Files         794      796       +2     
  Lines       40545    40750     +205     
==========================================
+ Hits        37588    37792     +204     
- Misses       2957     2958       +1     

Flag	Coverage Δ
e2e	47.87% <ø> (+0.01%)	⬆️
integration	24.18% <ø> (-0.10%)	⬇️
unit	90.55% <ø> (+0.01%)	⬆️

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[cheggerdev]

Thank you for the suggestion @cheggerdev

Does this modified document match your experiences? Are there any further details that you think I should add?

Hi @dewi-tik,

Thank you for the work. Yes, this matches my experience. Failing to add the (self signed) associated CA results in rejecting the JWT due fullchain validation failure.

I suppose, this must be done so for all Apps with Java based authentication.

[dominic-r]

to be modified to match new document template

we can do this in the pr i'm working on, Each PR should ideally stick to it's title/linked issue to keep tracking easy