[eas-cli] Support excluding .git via .easignore (#2879)

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# Why

Currently it's not possible to exclude `.git` from being uploaded in project tarball.

# How

In `makeShallowCopyAsync()` we first clone the repository, then we delete files ignored by `.easignore` and then we copy working directory over.

The "delete files ignored by `.easignore`" step is governed by `git ls-files --exclude-from=.easignore`. `git ls-files` is never going to consider `.git` directory to be excluded, even if specified in `.easignore`, so we need to special-case the `.git` directory and remove it manually if specified.

# Test Plan

Added `.git` to a test `.easignore`, ran `eas build:inspect` and confirmed the copied directory did _not_ contain `.git` folder.

Author: sjchmiela

CHANGELOG.md

@@ -12,6 +12,7 @@ This is the log of notable changes to EAS CLI and related packages.
 
 - Fixed `GitClient` not respecting `.easignore` file. ([#2873](https://github.com/expo/eas-cli/pull/2873) by [@sjchmiela](https://github.com/sjchmiela))
 - Fix symlink support in `makeShallowCopyAsync`. ([#2874](https://github.com/expo/eas-cli/pull/2874) by [@sjchmiela](https://github.com/sjchmiela))
+- Allow excluding `.git` directory from project archive by adding it to `.easignore`. ([#2879](https://github.com/expo/eas-cli/pull/2879) by [@sjchmiela](https://github.com/sjchmiela))
 
 ### 🧹 Chores
 

packages/eas-cli/src/vcs/clients/git.ts

@@ -212,6 +212,12 @@ export default class GitClient extends Client {
         await Promise.all(
           cachedFilesWeShouldHaveIgnored.map(file => fs.rm(path.join(destinationPath, file)))
         );
+
+        // Special-case `.git` which `git ls-files` will never consider ignored.
+        const ignore = await Ignore.createAsync(rootPath);
+        if (ignore.ignores('.git')) {
+          await fs.rm(path.join(destinationPath, '.git'), { recursive: true, force: true });
+        }
       }
     } finally {
       await setGitCaseSensitivityAsync(isCaseSensitive, rootPath);
@@ -284,6 +290,7 @@ export default class GitClient extends Client {
     );
   }
 
+  /** NOTE: This method does not support checking whether `.git` is ignored by `.easignore` rules. */
   public override async isFileIgnoredAsync(filePath: string): Promise<boolean> {
     const rootPath = await this.getRootPathAsync();
 
@@ -309,6 +316,7 @@ export default class GitClient extends Client {
             { cwd: rootPath }
           )
         ).stdout.trim() !== '';
+
       // File is considered ignored if:
       // - makeShallowCopyAsync() will not copy it to the clone
       // AND