chore: add .git to .dockerignore

[maze88]

No description provided.

[github-actions]

Thanks for your PR,
To run vendors CIs, Maintainers can use one of:

• /test-all: To run all tests for all vendors.
• /test-e2e-all: To run all E2E tests for all vendors.
• /test-e2e-nvidia-all: To run all E2E tests for NVIDIA vendor.

To skip the vendors CIs, Maintainers can use one of:

• /skip-all: To skip all tests for all vendors.
• /skip-e2e-all: To skip all E2E tests for all vendors.
• /skip-e2e-nvidia-all: To skip all E2E tests for NVIDIA vendor.
  Best regards.

[greptile-apps]

Greptile Overview

Greptile Summary

This PR adds a .dockerignore file that excludes .git/ from the Docker build context. This reduces build-context size and prevents VCS metadata from being copied into images, aligning with typical Docker build best practices.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk.
• Change is limited to adding .git/ to .dockerignore, which only affects Docker build context contents and does not alter runtime logic.
• No files require special attention

Important Files Changed

Filename	Overview
.dockerignore	Adds .dockerignore entry to exclude the .git directory from Docker build context.

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Git as Git repo
    participant Docker as Docker build

    Dev->>Git: Add `.dockerignore` with `.git/`
    Dev->>Docker: docker build (sends build context)
    Docker->>Git: Exclude `.git/` from build context per `.dockerignore`
    Docker-->>Dev: Build uses smaller context (no VCS metadata)

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[greptile-apps]

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