Fix non-interactive mode prompting for git initialization

[EvanBacon]

Summary

• Fixes eas build --non-interactive prompting interactively when the project doesn't have git initialized
• In non-interactive mode, automatically runs git init and creates an initial commit
• Shows informative message: No git repository found. Auto initializing in /path. Set EAS_NO_VCS=1 to skip.
• Improved error message when git user.name/email not configured to show exact commands to run

Test plan

• Run eas build --non-interactive in a project without git initialized
• Verify it auto-initializes git instead of prompting
• Verify EAS_NO_VCS=1 eas build --non-interactive skips git initialization

🤖 Generated with Claude Code

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder
packages/eas-cli/src/commands/update/**	@wschurman, @quinlanj
packages/eas-cli/src/commands/build/**	@sjchmiela
packages/eas-cli/src/build/**	@sjchmiela

Generated by CodeMention

[github-actions]

Size Change: -1.67 kB (0%)

Total Size: 72.7 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	72.7 MB	-1.67 kB (0%)

_{compressed-size-action}

[codecov]

Codecov Report

❌ Patch coverage is 7.14286% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.29%. Comparing base (42940b7) to head (e9088db).

Files with missing lines	Patch %	Lines
packages/eas-cli/src/vcs/clients/git.ts	0.00%	18 Missing and 2 partials ⚠️
packages/eas-cli/src/commands/build/dev.ts	0.00%	2 Missing ⚠️
packages/eas-cli/src/build/runBuildAndSubmit.ts	0.00%	1 Missing ⚠️
packages/eas-cli/src/commands/build/configure.ts	0.00%	1 Missing ⚠️
packages/eas-cli/src/commands/build/inspect.ts	0.00%	1 Missing ⚠️
packages/eas-cli/src/commands/update/configure.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3387      +/-   ##
==========================================
- Coverage   52.31%   52.29%   -0.01%     
==========================================
  Files         804      804              
  Lines       33425    33437      +12     
  Branches     6975     6981       +6     
==========================================
  Hits        17482    17482              
- Misses      14555    14566      +11     
- Partials     1388     1389       +1     

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[douglowder]

In non-interactive mode, we should definitely not prompt. Thanks for fixing that! However, we should not execute a git operation under the hood. I'd prefer that we throw an error stating that the command requires a git repo.

[EvanBacon]

@douglowder my thinking here is that git is pretty easy to delete and users can opt-out of this behavior by: a) having a git repo, or b) setting EAS_NO_VCS=1 which skips all git checks. I imagine we can pull this back a bit by skipping the auto git setup for commands that don't need git to operate (but I'm not sure which those are).

[github-actions]

✅ Thank you for adding the changelog entry!