add CI workflow

[jens-maus]

This adds an initial CI workflow to check build upon changes.

Summary by CodeRabbit

• Chores
  • Added automated build validation for four supported Linux platforms.
  • Builds now run consistently across native and cross-compiled environments.
  • Automated checks verify that required binaries, libraries, web assets, and device definitions are present and correctly formatted.
  • Unsupported target platforms now produce a clear build failure instead of an ambiguous result.
  • Build jobs can run automatically for updates, pull requests, or manual verification.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: a9ded6b7-46b2-4343-b4fc-5afb5f8eaa59

📥 Commits

Reviewing files that changed from the base of the PR and between ff6939f and 5539190.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

Changes

Cross-platform CI build

Layer / File(s)	Summary
Workflow triggers and platform matrix .github/workflows/ci.yml	The workflow runs on pushes to main, pull requests, and manual dispatch. It defines four target platforms, read-only permissions, concurrency cancellation, checkout, and conditional QEMU setup.
Containerized target build .github/workflows/ci.yml	Each target builds in a Debian Bookworm container. The workflow installs dependencies, prepares cross-compiler links, and runs the selected CMake preset.
Staged artifact verification .github/workflows/ci.yml	The workflow checks required artifacts, binary formats, webui files, and device-type XML counts when assets are enabled.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: ⚪ Minimal · up to 55391

This change adds a read-only, containerized CI workflow that builds and verifies artifacts for four target platforms. No concrete merge-blocking risk remains.

Sequence Diagram(s)

sequenceDiagram
  participant GitHubActions
  participant QEMU
  participant Docker
  participant CMake
  participant Verification
  GitHubActions->>QEMU: Set up emulation for non-native targets
  GitHubActions->>Docker: Run Debian Bookworm build container
  Docker->>CMake: Configure and build target preset
  CMake-->>Docker: Create staged rootfs artifacts
  Docker->>Verification: Check artifacts and binary formats
  Verification-->>GitHubActions: Pass or fail the build

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the primary change: adding a GitHub Actions CI workflow. It is concise and specific enough for the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pr/add-ci-workflow

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