Github workflow for HTTPServer test

[samutamm]

Run build/test/httpserver_test.sh as a github workflow. Trigger run only when unittests succeed.

[megaeasex]

[TASK:easegress-pr-test SUCCESS]megaease/easegress Pull Request 356 Deploy Test Success

[localvar]

Is it possible to not create a new workflow?
For example, add this test as a new step of the existing workflow after the unittests.

[codecov-commenter]

Codecov Report

Merging #356 (a0ca674) into main (23329d3) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #356      +/-   ##
==========================================
- Coverage   80.58%   80.45%   -0.13%     
==========================================
  Files          54       54              
  Lines        6217     6217              
==========================================
- Hits         5010     5002       -8     
- Misses        942      949       +7     
- Partials      265      266       +1     

Impacted Files	Coverage Δ
pkg/object/mqttproxy/client.go	79.87% <0.00%> (-1.22%)	⬇️
pkg/cluster/cluster.go	48.76% <0.00%> (-1.06%)	⬇️

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