Use Entrypoint instead of CMD for dockerfile

[xlight05]

Purpose

• $Subject
• Resolves Use Entrypoint instead of CMD for running the executable #771

[codecov]

Codecov Report

Attention: Patch coverage is 76.66667% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 82.47%. Comparing base (3afe2dc) to head (1390414).

Files	Patch %	Lines
...n/java/io/ballerina/c2c/utils/DockerGenerator.java	70.58%	4 Missing and 1 partial ⚠️
.../io/ballerina/c2c/utils/NativeDockerGenerator.java	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #774      +/-   ##
============================================
+ Coverage     82.37%   82.47%   +0.10%     
- Complexity      397      399       +2     
============================================
  Files            47       47              
  Lines          2179     2186       +7     
  Branches        270      270              
============================================
+ Hits           1795     1803       +8     
+ Misses          255      254       -1     
  Partials        129      129              

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