[eas-cli] remove image override in eas build:resign

[hSATAC]

Why

eas build:resign currently passes a hardcoded builderEnvironment: { image: 'default' } override to the server when retrying an iOS build. It was added as a placeholder when the command was first introduced (#1575, 2022).

This override is now unnecessary at best, broken at worst:

• For regular eas build parents, the server falls back to a default image when one isn't specified, so the override is redundant.
• For EAS Workflow-triggered parents, the build infrastructure no longer recognizes 'default' as a valid image alias. The hardcoded override silently replaces the parent build's resolved concrete image (e.g. macos-sequoia-15.6-xcode-26.2) with 'default', causing eas build:resign to fail with an unknown image error.

The correct behavior in both cases is "resign with the parent's image" — which is exactly what happens when this override is absent.

How

Drop the builderEnvironment field from the resign jobOverrides payload. The server-side retry path then picks up the parent build's image automatically:

• Regular eas build parents: same behavior as before (server falls back to a default on its side).
• EAS Workflow-triggered parents: the parent's concrete image flows through; resign no longer fails with unknown image.

Android resign is explicitly unsupported (the command throws on Android), so this affects iOS only.

Test Plan

• Automation tests

[linear]

ENG-20894 Remove image override in eas build:resign

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

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[Copilot]

Pull request overview

Removes an outdated builderEnvironment.image: 'default' override from the eas build:resign retry payload so the server can preserve (or default) the build image based on the parent build, avoiding failures for Workflow-triggered parent builds.

Changes:

• Remove hardcoded builderEnvironment: { image: 'default' } from iOS resign jobOverrides payload.
• Add a changelog entry documenting the bug fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/eas-cli/src/commands/build/resign.ts	Stops overriding the builder image during iOS build resign retry so the parent build image can be used.
CHANGELOG.md	Records the bug fix in the main changelog.

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[codecov]

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Additional details and impacted files

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