Add env credentials provider

[JacksonTian]

You need to complete

• unit tests and/or feature tests
• documentation is changed or added

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.47%. Comparing base (a7ec9d5) to head (4e7998f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   96.51%   96.47%   -0.05%     
==========================================
  Files          28       30       +2     
  Lines        1923     2040     +117     
==========================================
+ Hits         1856     1968     +112     
- Misses         55       58       +3     
- Partials       12       14       +2     

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