ci: agregar workflow de build (backend y frontend)

Author: AlfreMu

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [ "main" ]
+  push:
+    branches: [ "main" ]
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    strategy:
+      fail-fast: false
+      matrix:
+        service:
+          - name: backend
+            context: ./backend
+          - name: frontend
+            context: ./frontend
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build ${{ matrix.service.name }}
+        uses: docker/build-push-action@v6
+        with:
+          context: ${{ matrix.service.context }}
+          push: false
+          tags: devops-portfolio/${{ matrix.service.name }}:ci
+          cache-from: type=gha
+          cache-to: type=gha,mode=max