Implement proxy uri, url config validation, redis minors

[sergicastro]

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[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (76e9f95) 89.02% compared to head (9562077) 88.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   89.02%   88.99%   -0.03%     
==========================================
  Files          14       14              
  Lines         966     1009      +43     
==========================================
+ Hits          860      898      +38     
- Misses         77       80       +3     
- Partials       29       31       +2     

Files	Coverage Δ
internal/config.go	97.50% <100.00%> (-2.50%)	⬇️
internal/oidc/redis.go	74.63% <100.00%> (+0.95%)	⬆️
internal/oidc/session.go	54.68% <100.00%> (ø)
internal/authz/oidc.go	89.58% <0.00%> (-0.86%)	⬇️