Ignore build/ directory and remove generated artifacts from version control

[nilgaar]

Chore

Describe the chore

The build/ directory currently contains packaged Helm chart archives (.tgz files) that are tracked in Git. These are generated artifacts produced by running sh build.sh and should not be committed to the repository.

This task involves:

• Removing the existing build/ directory from version control
• Adding build/ to .gitignore to prevent future accidental commits

This keeps the repository clean and focused on source files only.

Additional context