Add GitHub Actions CI workflow to gate PRs on API build and test success

[Copilot]

No CI existed to validate changes before merging into main. PRs could be merged regardless of build or test failures.

Changes

• .github/workflows/api-ci.yml — new workflow triggered on pull_request targeting main:
  • Runs on ubuntu-latest (Docker available for Testcontainers.MsSql)
  • Sets up .NET 10.0, restores, builds (Release), and runs the full xUnit suite
  • Job scoped to permissions: contents: read

on:
  pull_request:
    branches:
      - main

jobs:
  build-and-test:
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-dotnet@v4
        with:
          dotnet-version: '10.0.x'
      - run: dotnet restore
        working-directory: API
      - run: dotnet build --no-restore --configuration Release
        working-directory: API
      - run: dotnet test --no-build --configuration Release --verbosity normal
        working-directory: API

Branch Protection Required

The workflow reports pass/fail but merging is only blocked once a branch protection rule is configured:

Settings → Branches → main → Require status checks → add "Build and Test"

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[Copilot]

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