Support GOOGLE_APPLICATION_CREDENTIALS_JSON

[k1LoW]

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[codecov]

Codecov Report

Merging #317 (c923963) into master (4409bd3) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #317      +/-   ##
==========================================
- Coverage   67.02%   66.95%   -0.07%     
==========================================
  Files          26       26              
  Lines        4318     4318              
==========================================
- Hits         2894     2891       -3     
- Misses       1132     1134       +2     
- Partials      292      293       +1     

Impacted Files	Coverage Δ
datasource/datasource.go	40.14% <0.00%> (-2.12%)	⬇️

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