(re-) enabled coverage for debug builds

[gfoidl]

Fixes #29

[codecov]

Codecov Report

Merging #110 into master will decrease coverage by 1.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
- Coverage   98.61%   97.24%   -1.37%     
==========================================
  Files          21       17       -4     
  Lines        1585     1780     +195     
==========================================
+ Hits         1563     1731     +168     
- Misses         22       49      +27

Impacted Files	Coverage Δ
source/gfoidl.Base64/Internal/Base64EncoderImpl.cs	91.2% <0%> (-2.91%)	⬇️
source/gfoidl.Base64/Base64.cs	94.44% <0%> (-2.11%)	⬇️
...l/Base64Encoder/Base64Encoder.Decode.netcoreapp.cs	97.46% <0%> (-2.08%)	⬇️
...64UrlEncoder/Base64UrlEncoder.Decode.netcoreapp.cs	98.05% <0%> (-1.95%)	⬇️
...ternal/Base64UrlEncoder/Base64UrlEncoder.Decode.cs	96.42% <0%> (-1.62%)	⬇️
source/gfoidl.Base64/Internal/Vector128Helper.cs	91.11% <0%> (-1.49%)	⬇️
source/gfoidl.Base64/Internal/Vector256Helper.cs	93.1% <0%> (-1.35%)	⬇️
...l/Base64Encoder/Base64Encoder.Encode.netcoreapp.cs	98.8% <0%> (-1.2%)	⬇️
...64UrlEncoder/Base64UrlEncoder.Encode.netcoreapp.cs	98.8% <0%> (-1.2%)	⬇️
...e64/Internal/Base64Encoder/Base64Encoder.Decode.cs	97.56% <0%> (-0.86%)	⬇️
... and 9 more

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