fix(app-connections): github app connection creation

[DanielHougaard]

Description 📣

This PR is a fix for creating/updating github app connections. It fails due to host being undefined, which is always the case when creating app connections without a custom github instance.

Type ✨

• Bug fix
• New feature
• Improvement
• Breaking change
• Documentation

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[maidul98]

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[greptile-apps]

Greptile Summary

This PR fixes a bug in GitHub app connection creation where undefined host values were causing connection failures. The fix implements conditional object spreading using the pattern ...(credentials?.host && { host: credentials.host }) to only include the host field when it has a truthy value.

The changes are applied to four locations in the GitHub OAuth callback handler:

• Two update operations (with and without installationId)
• Two create operations (for App and OAuth methods)

This addresses the common scenario where users connect to the default GitHub instance (github.com) rather than a custom GitHub Enterprise instance. In these cases, credentials.host would be undefined, but the previous code was always including it in the API request payload, which likely caused validation errors on the backend.

The fix ensures that standard GitHub connections omit the host field entirely, while GitHub Enterprise connections with custom hostnames still include the host field as expected. This maintains backward compatibility while resolving the connection creation failures.

Confidence score: 4/5

• This is a safe bug fix that resolves a clear functional issue with GitHub app connections
• The conditional spread syntax is a standard JavaScript pattern that properly handles undefined values
• The fix is applied consistently across all relevant code paths (update/create operations for both OAuth and App methods)

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