ci: add Docker CI workflow to build and push image

Author: vianavitor-dev

.github/workflows/docker-image.yml

@@ -0,0 +1,20 @@
+name: Build and Push to Docker Hub
+on:
+  push:
+    branches: [ "main" ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: vianavitor/slibrarygm-app:latest