added workflow

.github/workflows/ci-build.yml

@@ -0,0 +1,37 @@
+name: Build and Push Docker Image
+
+on:
+  pull_request:
+    types: [closed]
+    branches:
+      - main
+    labels:
+      - 'CI:Build'
+
+jobs:
+  build:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build the Docker image
+        run: |
+          docker build -t dzivdzi/go-ethereum:${{ github.sha }} .
+          docker tag dzivdzi/go-ethereum:${{ github.sha }} dzivdzi/go-ethereum:latest
+
+      - name: Push the Docker image
+        run: |
+          docker push dzivdzi/go-ethereum:${{ github.sha }}
+          docker push dzivdzi/go-ethereum:latest