refactor: migrar GitLab → Gitea (aulas 10, 11, 13)

- Aula 10: Gitea + Registry + Actions + Runner (substituiu GitLab)
  - gitea-values.yaml: PostgreSQL standalone, Valkey standalone, ~800Mi RAM
  - setup.sh/cleanup.sh: namespace gitea, Helm gitea-charts/gitea + actions
  - README.md: documentação completa com de→para (GitLab/Harbor/Tekton vs Gitea)

- Aula 11: ArgoCD (GitOps) — removido GitLab Runner (runner vive na aula-10)
  - setup.sh: só ArgoCD, integração SSH com Gitea
  - node-bugado/.gitea/workflows/ci.yml: pipeline convertida

- Aula 13: Container Factory — atualizado para Gitea
  - setup.sh/cleanup.sh: referências GitLab → Gitea
  - pipelines/postgresql/ci.yml: Gitea Actions workflow
  - README.md: conexão com act_runner explicada

- CLAUDE.md: tabela de aulas atualizada

aula-11/node-bugado/.gitea/workflows/ci.yml

@@ -0,0 +1,77 @@
+# =============================================================================
+# Gitea Actions Workflow - node-bugado
+# =============================================================================
+#
+# Pipeline GitOps:
+#   1. Build: Constrói imagem Docker e faz push para Gitea Registry
+#   2. Deploy: Atualiza manifests no repo GitOps (ArgoCD faz sync)
+#
+# Secrets necessários (Repository → Settings → Actions → Secrets):
+#   - REGISTRY_TOKEN: Token para push no Gitea Container Registry
+#   - DEPLOY_KEY: Chave SSH privada para push no repo GitOps
+#   - GITOPS_REPO: URL SSH do repo GitOps (ex: git@gitea.kube.quest:user/gitops-demo.git)
+#
+# =============================================================================
+
+name: Build and Deploy
+
+on:
+  push:
+    branches: [main]
+
+env:
+  REGISTRY: gitea.kube.quest
+  IMAGE_NAME: ${{ gitea.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login to Gitea Registry
+        run: |
+          echo "${{ secrets.REGISTRY_TOKEN }}" | docker login ${{ env.REGISTRY }} \
+            -u ${{ gitea.actor }} --password-stdin
+
+      - name: Build and push
+        run: |
+          echo "Building ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}"
+          docker build \
+            -t ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }} \
+            -t ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest \
+            .
+          docker push ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
+          docker push ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Setup SSH
+        run: |
+          mkdir -p ~/.ssh
+          echo "${{ secrets.DEPLOY_KEY }}" > ~/.ssh/id_ed25519
+          chmod 600 ~/.ssh/id_ed25519
+          ssh-keyscan gitea.kube.quest >> ~/.ssh/known_hosts 2>/dev/null || true
+
+      - name: Update GitOps repo
+        run: |
+          git config --global user.email "ci@gitea.kube.quest"
+          git config --global user.name "Gitea CI"
+
+          git clone ${{ secrets.GITOPS_REPO }} gitops
+          cd gitops
+
+          SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-8)
+
+          if [ -f apps/node-bugado/deployment.yaml ]; then
+            sed -i "s|image:.*node-bugado.*|image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}|g" apps/node-bugado/deployment.yaml
+            git add apps/node-bugado/deployment.yaml
+            git commit -m "deploy: node-bugado ${SHORT_SHA} [skip ci]"
+            git push
+            echo "GitOps repo updated"
+          else
+            echo "WARNING: apps/node-bugado/deployment.yaml not found"
+            exit 1
+          fi