phase 2: enable docker build and push via github actions

Author: karandeven

.github/workflows/ci.yml

@@ -1,16 +1,32 @@
-name: omniops-ci
+name: OmniOps CI Pipeline
 
 on:
   push:
-    branches: [ "main" ]
+    branches:
+      - main
 
 jobs:
-  build:
+  build-and-push:
     runs-on: ubuntu-latest
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Build Docker image
-        run: docker build -t omniops-app -f docker/Dockerfile .
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: docker/Dockerfile
+          push: true
+          tags: karandeven/omniops-app:latest
+