fix(cli): terminate each GITHUB_ENV/GITHUB_OUTPUT entry with a trailing newline

[codewithsupra]

Problem

setGithubActionsOutputAndEnvVars in packages/cli-v3/src/utilities/githubActions.ts builds entries with .map(...).join('\n') — which separates entries but leaves the last entry without a trailing newline.

Both $GITHUB_ENV and $GITHUB_OUTPUT are job-scoped append files. Without a trailing newline, the last written entry (needsPromotion=...) is left on an unterminated line. Any subsequent write by the runner or another step can concatenate onto it, producing merged/malformed values like needsPromotion=trueSOME_OTHER_KEY=value — breaking promotion branching. The bug is intermittent because GitHub Actions sometimes inserts its own newline.

Fix

Match the @actions/core convention — every entry gets its own trailing \n:

- .map(([key, value]) => `${key}=${value}`)
- .join("\n");
+ .map(([key, value]) => `${key}=${value}\n`)
+ .join("");

Applied to both the GITHUB_ENV and GITHUB_OUTPUT writes.

Fixes #4003

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[github-actions]

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[coderabbitai]

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• packages/cli-v3/src/utilities/githubActions.ts

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Walkthrough

The change updates setGithubActionsOutputAndEnvVars so both GITHUB_ENV and GITHUB_OUTPUT content strings are built by adding a trailing newline to each key=value entry and joining with an empty separator. The file append calls remain unchanged.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.