ci: add github actions for ruff + pytest l1+l2

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Install deps (CPU-only, skip ace-step + mlx)
+        run: |
+          python -m pip install --upgrade pip
+          pip install ruff pytest gradio safetensors peft pyloudnorm numpy
+      - name: Lint
+        run: |
+          ruff format --check .
+          ruff check .
+      - name: Tests (L1+L2, no GPU)
+        run: pytest -m "not gpu" --tb=short