Fix: address bundle config deprecation warning

[aramprice]

Addresses:

[DEPRECATED] Using the `config` command without a subcommand [list, get, set, unset] is deprecated and will be removed in the future. Use `bundle config set --global path /usr/local/bundle` instead.

... in ci image build

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Run ID: 7e667a88-6120-491f-8dca-c456c685b806

📥 Commits

Reviewing files that changed from the base of the PR and between 32b19ed and bb0fece.

📒 Files selected for processing (1)

• ci/docker/Dockerfile

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Walkthrough

This pull request updates the Docker image build configuration to use current Bundler CLI syntax. The Ruby installation RUN block in the Dockerfile was modified to invoke bundle config set --global instead of the deprecated bundle config --global syntax for configuring Bundler's global path and bin settings.

Suggested reviewers

• colins
• a-hassanin

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change—updating deprecated bundle config commands to use the set subcommand to address deprecation warnings.
Description check	✅ Passed	The description clearly explains the deprecation warning being addressed and the context of the change in the CI image build.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-bundle-deprecation

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[Copilot]

Pull request overview

This PR updates the CI Docker image build to use the non-deprecated Bundler configuration command form.

Changes:

• Replaces deprecated bundle config --global ... usage with bundle config set --global ....
• Keeps existing Bundler path and bin configuration values unchanged.

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