Adds CI checks with Credo and updates Elixir version

[bponghneng]

Improves code quality and consistency by integrating Credo static analysis into the CI workflow.

• Configures a new Credo workflow to run on push, pull request, and scheduled triggers.
• Updates Elixir version to 1.18 in mix.exs and the Credo workflow for compatibility.
• Ensures dev.local.exs is only imported when the file exists, preventing errors in environments where it's absent.

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This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.