Add TLS support for Redis Client implementation

[mihkelparna1]

Summary

Adds support for using TLS when establishing a Redis Client. This becomes a mandatory step when using systems like Elasticache that enforce client TLS when set up to run in a Multi-AZ way.

Release Note

• Adds TLS configuration by default to the Redis client implementation, this can be disabled by using insecureSkipVerify flag, closes Missing TLS support for Redis Client #1999 issue

Documentation

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (488eb97) 66.46% compared to head (3b7485d) 48.86%.
Report is 18 commits behind head on main.

Files	Patch %	Lines
pkg/api/api.go	0.00%	11 Missing ⚠️
pkg/indexstorage/redis/redis.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1998       +/-   ##
===========================================
- Coverage   66.46%   48.86%   -17.60%     
===========================================
  Files          92       80       -12     
  Lines        9258     6626     -2632     
===========================================
- Hits         6153     3238     -2915     
- Misses       2359     2982      +623     
+ Partials      746      406      -340     

Flag	Coverage Δ
e2etests	?
unittests	48.86% <0.00%> (+1.18%)	⬆️

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[bobcallaway]

I think this should be ready to merge once the last comment is addressed - thanks for all the help on this :)

[haydentherapper]

This also needs to be set in

rekor/pkg/indexstorage/redis/redis.go

Line 45 in d596e9d

// by converting all characters into a lowercase value before looking up in Redis

, which is for the search index. The change you made here is just for the checkpoints we write to redis.

[mihkelparna1]

This also needs to be set in

rekor/pkg/indexstorage/redis/redis.go

Line 45 in d596e9d

// by converting all characters into a lowercase value before looking up in Redis

, which is for the search index. The change you made here is just for the checkpoints we write to redis.

Something along the lines of this -> 3b7485d ?

[haydentherapper]

Thanks!