fix: updates the exec cmd to start user application

[re-Tick]

Related Issue

• user env variables are of the root to start user application

Closes: #1634

Describe the changes you've made

Run the user application in a shell which is started by the user shell by using the sudo -u <username> sh -c cmd to preserve the user env variables.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Please let us know if any test cases are added

Tested with the env cmd to check the user env variables are correctly passed or not.

Describe if there is any unusual behaviour of your code(Write NA if there isn't)

A clear and concise description of it.

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

[Sarthak160]

LGTM