Allow setting the Oauth provider via the environment.

[janimo]

Fixes #3675

[codecov[bot]]

Codecov Report

Merging #3698 (0bd5366) into master (9cc50af) will decrease coverage by 0.00%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3698      +/-   ##
==========================================
- Coverage   83.55%   83.55%   -0.01%     
==========================================
  Files         207      207              
  Lines       29642    29645       +3     
==========================================
+ Hits        24767    24769       +2     
- Misses       4875     4876       +1     

Flag	Coverage Δ
ui-tests	31.87% <0.00%> (-0.01%)	:arrow_down:
unitexamples-tests	78.22% <66.66%> (+<0.01%)	:arrow_up:

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Impacted Files	Coverage Δ
panel/command/serve.py	37.11% <66.66%> (+0.39%)	:arrow_up:
panel/tests/util.py	84.37% <0.00%> (-2.09%)	:arrow_down:
panel/config.py	60.56% <0.00%> (+0.56%)	:arrow_up:

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[philippjfr]

Thanks @janimo!