feat: update ci config & fix clippy warnings

[MuZhou233]

Fix: #27

• Update all of the ci configs, again refer to fix: CI error diesel-adapter#86
• Edit code to solve clippy warnings

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (627ca2e) 70.58% compared to head (0133b2e) 48.30%.
Report is 9 commits behind head on master.

Files	Patch %	Lines
src/casbin_actor.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master      #28       +/-   ##
===========================================
- Coverage   70.58%   48.30%   -22.29%     
===========================================
  Files           3        1        -2     
  Lines         255      118      -137     
===========================================
- Hits          180       57      -123     
+ Misses         75       61       -14     

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