Fix uppercase from_secrets

[anbraten]

Secret names where matched based on their lowercase value already just the conversion to lowercase for from_secrets was missing.

[codecov-commenter]

Codecov Report

Merging #842 (f9ef9b2) into master (80c72b5) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #842      +/-   ##
==========================================
- Coverage   51.76%   51.68%   -0.09%     
==========================================
  Files          80       80              
  Lines        6054     6054              
==========================================
- Hits         3134     3129       -5     
- Misses       2741     2746       +5     
  Partials      179      179              

Impacted Files	Coverage Δ
server/logging/log.go	48.83% <0.00%> (-5.82%)	⬇️

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[6543]

please backport ;)

[anbraten]

I will try to fix the image filtering in from_secret first and then backport both to 0.15