Add healthcheck for render

[tanin47]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 50.00%. Comparing base (2b9cfb8) to head (ffe18e4).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/tanin/ejwf/Main.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #18   +/-   ##
=========================================
  Coverage     50.00%   50.00%           
  Complexity       10       10           
=========================================
  Files             2        2           
  Lines           104      106    +2     
  Branches          6        6           
=========================================
+ Hits             52       53    +1     
- Misses           48       49    +1     
  Partials          4        4           

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