Adding the debug.keystore file back

[bondehagen]

Fixes #25629 that happened after v60 upgrade when using the diff tool https://react-native-community.github.io/upgrade-helper/?from=0.59.10&to=0.60.4

Summary

When following the diff for upgrading to react native 60. The debug.keystore is missing. It's added in the repository but ignored in the .gitignore, so it does not show. This adds an exception for this file.

Changelog

[Android] [Fixed] - Add exception in .gitignore for debug.keystore to the android template.

Test Plan

Create a new project from template and check that debug.keystore will be checked in when committing.

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Messages

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📋 Verify Changelog Format - A changelog entry has the following format: [CATEGORY] [TYPE] - Message. CATEGORY may be: General iOS Android JavaScript Internal (for changes that do not need to be called out in the release notes) TYPE may be: Added, for new features. Changed, for changes in existing functionality. Deprecated, for soon-to-be removed features. Removed, for now removed features. Fixed, for any bug fixes. Security, in case of vulnerabilities. MESSAGE may answer "what and why" on a feature level. Use this to briefly tell React Native users about notable changes.

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@mdvacca has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[mdvacca]

Importing for review

[react-native-bot]

This pull request was successfully merged by @bondehagen in d550256.

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