Add CI workflow

[johannesschiessl]

Summary

• Add GitHub Actions CI for pushes to main, pull requests, and manual runs.
• Verify formatting, linting, types, and tests with pinned Node.js and pnpm versions.
• Build the web and desktop applications with concurrency cancellation and a 20-minute timeout.

Testing

• Not run locally; this change adds the CI checks that run in GitHub Actions.

[cubic-dev-ai]

All reported issues were addressed across 1 file

Architecture diagram

sequenceDiagram
    participant GitHub as GitHub (Push/PR/Manual)
    participant Actions as GitHub Actions CI
    participant Runner as Verify Job (ubuntu-latest)
    participant Repo as Repository
    participant Pnpm as pnpm 11.9.0
    participant Node as Node.js 24
    participant Code as Codebase

    Note over GitHub,Code: CI Pipeline Flow

    alt Event: Push to main OR Pull request OR Manual trigger
        GitHub->>Actions: Trigger workflow
    end

    Actions->>Actions: Set concurrency: ci-$workflow-$ref
    opt If previous run in progress
        Actions->>Actions: Cancel in-progress run
    end

    Actions->>Runner: Start verify job (timeout: 20 min)
    Runner->>Repo: Check out code
    Repo-->>Runner: Repository code

    Runner->>Pnpm: Set up pnpm (version 11.9.0)
    Pnpm-->>Runner: pnpm ready

    Runner->>Node: Set up Node.js (version 24) with pnpm cache
    Node-->>Runner: Node.js ready

    Runner->>Pnpm: pnpm install --frozen-lockfile
    Pnpm->>Code: Install dependencies from lockfile
    Code-->>Pnpm: Dependencies installed
    Pnpm-->>Runner: Success

    Runner->>Pnpm: pnpm exec vp check
    Pnpm->>Code: Formatting, lint, type check
    Code-->>Pnpm: Results
    Pnpm-->>Runner: Pass/fail

    Runner->>Pnpm: pnpm exec vp run -r test
    Pnpm->>Code: Run all tests
    Code-->>Pnpm: Test results
    Pnpm-->>Runner: Pass/fail

    Runner->>Pnpm: pnpm --filter @showtime/web build
    Pnpm->>Code: Build web app
    Code-->>Pnpm: Build output
    Pnpm-->>Runner: Success/failure

    Runner->>Pnpm: pnpm --filter @showtime/desktop exec tsc
    Pnpm->>Code: TypeScript compilation for desktop
    Code-->>Pnpm: Compiled code
    Pnpm-->>Runner: Success/failure

    Runner->>Pnpm: pnpm --filter @showtime/desktop exec vp build --config electron.vite.config.ts
    Pnpm->>Code: Build desktop app with Electron
    Code-->>Pnpm: Build output
    Pnpm-->>Runner: Success/failure

    alt All steps succeed
        Runner-->>Actions: Job passed
        Actions-->>GitHub: ✅ Green check
    else Any step fails
        Runner-->>Actions: Job failed
        Actions-->>GitHub: ❌ Red X
    end

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