feat(auth): allow setting external secure

[muhlemmer]

This change adds the possibility to set an external secure flag to the Authenticator. This allows creating logout URLs with https protocol when the service is behind a reverse proxy.

Closes #285

Definition of Ready

• I am happy with the code
• Short description of the feature/issue is added in the pr description
• PR is linked to the corresponding user story
• Acceptance criteria are met
• All open todos and follow ups are defined in a new ticket and justified
• Deviations from the acceptance criteria and design are agreed with the PO and documented.
• No debug or dead code
• My code has no repetitions
• Critical parts are tested automatically
• Where possible E2E tests are implemented
• Documentation/examples are up-to-date
• All non-functional requirements are met
• Functionality of the acceptance criteria is checked manually on the dev system.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 0.05%. Comparing base (bfb0be0) to head (53cb67a).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/authentication/authenticate.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #389   +/-   ##
=====================================
  Coverage   0.05%   0.05%           
=====================================
  Files        127     127           
  Lines      92980   92983    +3     
=====================================
  Hits          47      47           
- Misses     92930   92933    +3     
  Partials       3       3           

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[github-actions]

🎉 This PR is included in version 3.2.0 🎉

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