[build-tools] Fix runtime version mismatch from premature fingerprint in eas build:internal

[AbbanMustafa]

Why

Workflow builds were failing with a false-positive "Runtime version mismatch" error for jobs using calculate expo updates.

Root cause: workflow builds have an extra internal phase build:internal that runs on the worker to resolve job config. The problem is the order of operations:

1. eas build:internal runs → computes fingerprint before PREBUILD → stores hash A in ctx.metadata.runtimeVersion
2. PREBUILD runs → createsios/ or android/ directory, native code is generated
3. CALCULATE_EXPO_UPDATES_RUNTIME_VERSION runs → computes fingerprint after PREBUILD → gets hash B
4. CONFIGURE_EXPO_UPDATES compares A vs B → mismatch → throws error

For some projects the fingerprint legitimately differs pre vs post prebuild because the react-native autolinking config changes once native directories exist. The fingerprint should reflect the post-prebuild state eas build:internal is just computing it too early.

How

Two changes:

1. Skip fingerprint computation in eas build:internal (build.ts). In INTERNAL mode, return {} instead of computing the fingerprint. This means ctx.metadata.runtimeVersion is never set from a stale pre-prebuild
   fingerprint, so the mismatch check in CONFIGURE_EXPO_UPDATES short-circuits and no error is thrown.
2. Write the correct post-prebuild fingerprint to the DB (expoUpdates.ts, android.ts, ios.ts). Since part 1 stops writing runtimeVersion to the DB from eas build:internal, we now write it from the CALCULATE_EXPO_UPDATES_RUNTIME_VERSION phase instead — after PREBUILD has run and native directories exist. This is gated on BuildTrigger.GIT_BASED_INTEGRATION since non-workflow builds still go through the normal build.ts path.

Test Plan

Trigger a workflow build on a project using runtimeVersion: { policy: 'fingerprint' } with a managed workflow (no pre-existing ios/ or android/ directories). Before this fix the build would fail in CONFIGURE_EXPO_UPDATES with "Runtime version calculated on local machine not equal to runtime version calculated during build."

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File Patterns	Mentions
**/*	@douglowder
packages/eas-cli/src/build/**	@sjchmiela

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[codecov]

Codecov Report

❌ Patch coverage is 29.41176% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.00%. Comparing base (4071f48) to head (67ef5bb).

Files with missing lines	Patch %	Lines
packages/build-tools/src/utils/expoUpdates.ts	20.00%	8 Missing ⚠️
packages/eas-cli/src/build/build.ts	0.00%	3 Missing ⚠️
packages/build-tools/src/builders/android.ts	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3893      +/-   ##
==========================================
- Coverage   59.01%   59.00%   -0.01%     
==========================================
  Files         935      935              
  Lines       40933    40947      +14     
  Branches     8624     8630       +6     
==========================================
+ Hits        24153    24156       +3     
- Misses      16684    16695      +11     
  Partials       96       96              

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