add GitHub Actions workflow for building and pushing Docker image

.github/workflows/docker-image.yml

@@ -0,0 +1,43 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      # Etapa 1: Checkout do código
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      # Etapa 2: Configurar Docker Buildx
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      # Etapa 3: Login no GitHub Container Registry (GHCR)
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: rodrigor
+          password: ${{ secrets.GHCR_TOKEN }}
+
+      # Etapa 4: Construir e enviar a imagem Docker para o GHCR
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: ghcr.io/rodrigor/embaralhado_indigena:latest
+
+      # Etapa 5: Logout do GHCR
+      - name: Log out from GitHub Container Registry
+        run: docker logout ghcr.io
+
+      # Etapa 6: Gatilho para implantar no Portainer
+      #- name: Trigger Portainer Deployment
+      #  run: curl -X POST ${{ secrets.PORTAINER_ESPRESSO_BOT_WEBHOOK_URL }}