ci: fix workflow file with correct YAML structure

Author: SynapseLayer

.github/workflows/ci.yml

@@ -1 +1,35 @@
-ci: add GitHub Actions workflow with pytest + coverage
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[dev]"
+
+      - name: Run tests with coverage
+        run: |
+          pytest --cov=synapse_memory --cov-report=xml -q
+
+      - name: Upload coverage to Codecov
+        if: matrix.python-version == '3.11'
+        uses: codecov/codecov-action@v4