feat: add ci workflows

.github/workflows/ci.yml

@@ -0,0 +1,108 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  commitlint:
+    name: PR Title (Conventional Commits)
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    steps:
+      - name: Validate PR title
+        uses: amannn/action-semantic-pull-request@v5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          types: |
+            feat
+            fix
+            docs
+            style
+            refactor
+            perf
+            test
+            build
+            ci
+            chore
+            revert
+
+  lint:
+    name: Lint & Format
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: backend
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+
+      - name: Set up Python
+        run: uv python install 3.12
+
+      - name: Install dependencies
+        run: uv sync --dev
+
+      - name: Ruff lint
+        run: uv run ruff check src/
+
+      - name: Ruff format check
+        run: uv run ruff format --check src/
+
+  test:
+    name: Tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: backend
+    services:
+      db:
+        image: postgres:16-alpine
+        env:
+          POSTGRES_USER: foresight
+          POSTGRES_PASSWORD: foresight
+          POSTGRES_DB: foresight_db
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd "pg_isready -U foresight -d foresight_db"
+          --health-interval 5s
+          --health-timeout 5s
+          --health-retries 5
+    env:
+      DATABASE_URL: postgresql+asyncpg://foresight:foresight@localhost:5432/foresight_db
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+
+      - name: Set up Python
+        run: uv python install 3.12
+
+      - name: Install dependencies
+        run: uv sync --dev
+
+      - name: Run migrations
+        run: uv run alembic upgrade head
+
+      - name: Pytest
+        # exit code 5 = no tests collected; treat as success until tests exist
+        run: |
+          code=0
+          uv run pytest -q || code=$?
+          if [ "$code" -eq 5 ]; then echo "No tests collected yet."; exit 0; fi
+          exit $code