Add GitHub Actions workflow for building and pushing Docker images

.github/workflows/docker.yml

@@ -0,0 +1,35 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - '**' # Esto aplica para cualquier rama
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write # Necesario para subir a GHCR
+
+    steps:
+      - name: Checkout del código
+        uses: actions/checkout@v4
+
+      - name: Configurar Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login en GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build y Push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          # Aquí usamos el nombre de la rama dinámicamente
+          tags: ghcr.io/dsaub/proyecto-mvc:${{ github.ref_name }}