ci: increase integration-test-build timeout from 45 to 90 minutes

[desmondcheongzx]

The 45-minute timeout from #6241 is still not enough — the build timed out again in this run because the Rust cache (Swatinem/rust-cache) missed entirely, forcing a cold build of all 676 crates. Bumping to 90 minutes so the cold build can complete and repopulate the cache.

Longer term we should investigate sccache or larger runners to make cold builds more robust.

[greptile-apps]

Greptile Summary

Doubled the integration-test-build job timeout from 45 to 90 minutes to accommodate cold Rust builds when the cache misses.

• Pragmatic fix for immediate CI reliability — cold builds of 676 crates exceeded the previous 45-minute limit
• Second timeout increase in recent commits (30→45→90 minutes), indicating cache miss is a recurring issue
• PR author acknowledges this is a band-aid and mentions investigating sccache or larger runners as long-term solutions

Confidence Score: 5/5

• Safe to merge — simple timeout adjustment with no code changes
• This is a minimal risk configuration change that only increases a CI timeout value. The change is well-justified by the linked CI run showing timeout failures, and the author has identified the root cause (cold cache forcing full rebuild of 676 crates). No logic changes or new functionality introduced.
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/pr-test-suite.yml	Increased integration-test-build timeout from 45 to 90 minutes to handle cold Rust cache builds

_{Last reviewed commit: 7e2b655}

[greptile-apps]

_{1 file reviewed, no comments}

_{Edit Code Review Agent Settings | Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.33%. Comparing base (f1ca321) to head (7e2b655).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6244      +/-   ##
==========================================
- Coverage   73.36%   73.33%   -0.03%     
==========================================
  Files         999      999              
  Lines      132543   132543              
==========================================
- Hits        97240    97207      -33     
- Misses      35303    35336      +33     

see 4 files with indirect coverage changes

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