[Infra] Compress the repository

Cloning the repo will consume ~200MB. We might compress the repository for better dev experience.

```console
git clone https://github.com/flutter/flutter-intellij
Cloning into 'flutter-intellij'...
remote: Enumerating objects: 68882, done.
remote: Counting objects: 100% (244/244), done.
remote: Compressing objects: 100% (109/109), done.
remote: Total 68882 (delta 174), reused 155 (delta 130), pack-reused 68638 (from 3)
Receiving objects: 100% (68882/68882), 183.27 MiB | 2.07 MiB/s, done.
Resolving deltas: 100% (25135/25135), done.
Updating files: 100% (21054/21054), done.
```