ci: Start a CI pipeline

[bryanalves]

Note

Low Risk
Low risk: adds a new CircleCI config that runs the existing rake test task in a Ruby container, without changing application logic.

Overview
Introduces a CircleCI pipeline via .circleci/config.yml that runs the project’s default rake task inside a ruby:3.1.3 Docker image, installing Bundler (2.4.10) and dependencies before executing tests.

^{Reviewed by Cursor Bugbot for commit 0470cba. Bugbot is set up for automated code reviews on this repo. Configure here.}

[ForwardFinancingAdmin]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.