Add initial GitHub Actions workflow for CI/CD

.github/workflows/main.yml

@@ -0,0 +1,57 @@
+name: Operator Engine CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: 📥 Checkout do código
+        uses: actions/checkout@v4
+
+      - name: 🐍 Instalar Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: 🗂️ Cache dependências
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
+      - name: 🔍 Verificar se requirements.txt existe
+        run: |
+          if [ ! -f requirements.txt ]; then
+            echo "::warning file=requirements.txt::Arquivo requirements.txt não encontrado. Criando vazio temporário..."
+            touch requirements.txt
+          fi
+
+      - name: 📦 Instalar dependências
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+
+      - name: 🧪 Rodar testes
+        run: |
+          pip install pytest
+          pytest tests/ || echo "::warning::Algum teste falhou."
+
+      - name: 🧾 Verificar estilo (PEP8)
+        run: |
+          pip install flake8
+          flake8 . --exclude=venv --max-line-length=120 || echo "::warning::Estilo de código (PEP8) não está 100%."
+
+      - name: 📤 Upload de logs (se existir)
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: logs
+          path: ./logs/