Add devcontaioner and related Dockerfile

[santoshkal]

This PR brings in minor improvements to genval rootCmd and adds a devcontainer setup and its related Dockerfile.
Closes: #65

Request review and approval, please: @devopstoday11

[dryrunsecurity]

Hi there 👋, @DryRunSecurity here, below is a summary of our analysis and findings.

DryRun Security	Status	Findings
Authn/Authz Analyzer	✅	0 findings
AppSec Analyzer	✅	0 findings
Configured Codepaths Analyzer	✅	0 findings
Sensitive Files Analyzer	✅	0 findings
Secrets Analyzer	✅	0 findings

Note

🟢 Risk threshold not exceeded.

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