Add GitHub Actions workflow for running tests

[Copilot]

Adds CI workflow to run the test suite on push/PR to main and dev branches.

Changes

• Create .github/workflows/test.yml with Node.js 20, yarn caching, and test execution
• Set explicit permissions: contents: read for least-privilege security

Workflow

- uses: actions/checkout@v4
- uses: actions/setup-node@v4
  with:
    node-version: '20'
    cache: 'yarn'
- run: yarn install --frozen-lockfile
- run: yarn test problems/**/*.test.ts

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com//advisories
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

add a github action workflow that will run test files to check if all tests are passing

note: the tests are using Node.js runners with typescript and yarn. you can use "yarn test" to run all tests

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