added a workflow for docker build test

Author: labrijisaad

.github/workflows/docker_test.yml

@@ -0,0 +1,25 @@
+name: Docker LLM RAG Build CI
+
+on:
+  push:
+    branches:
+      - main
+      - dev
+  pull_request:
+    branches:
+      - main
+      - dev
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Build Docker Image
+      run: |
+        docker build -t llm_rag_app:latest -f docker/Dockerfile .