[eas-cli] Detect valid JSON files during hosting upload

[kadikraman]

Why

The apple app site association file (needed for Universal linking on iOS) does not have a file extension, as it's simply served from /.well-known/apple-app-site-association.

However in order for it to be valid, the file need to return Content-Type: application/json header.

How

When content type cannot be detected form the mime type, try parsing the file to check if it's a valid JSON and set the header accordingly.

Test Plan

Deploy a website with an apple-app-site-association file and verify that the Content-Type header is set to application/json.

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@szdziedzic, @khamilowicz, @sjchmiela, @radoslawkrzemien

Generated by CodeMention

[github-actions]

Size Change: +2.78 kB (+0.01%)

Total Size: 53.4 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	53.4 MB	+2.78 kB (+0.01%)

_{compressed-size-action}

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 52.46%. Comparing base (d2e4cb5) to head (dd38e92).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/eas-cli/src/worker/upload.ts	16.67%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2829      +/-   ##
==========================================
- Coverage   52.47%   52.46%   -0.01%     
==========================================
  Files         584      584              
  Lines       22627    22637      +10     
  Branches     4465     4467       +2     
==========================================
+ Hits        11872    11874       +2     
- Misses      10721    10729       +8     
  Partials       34       34              

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[github-actions]

✅ Thank you for adding the changelog entry!