Add docker smoke test workflow

.github/workflows/docker-smoke-test.yml

@@ -0,0 +1,52 @@
+name: Docker Build Smoke Test
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  smoke-test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build
+        run: |
+          docker compose build \
+            --build-arg GIT_BRANCH="${{ github.ref_name }}" \
+            --build-arg GIT_COMMIT="${{ github.sha }}"
+
+      - name: Start container
+        run: docker compose up -d
+
+      - name: Wait for Streamlit to init and check health
+        run: |
+          echo "Waiting for Streamlit to be init..."
+          # checks the health endpoint every 5 seconds for up to 120 seconds
+          for i in {1..24}; do
+            if curl -s -f http://localhost:8501/_stcore/health > /dev/null; then
+              echo "✅ Streamlit is up and running!"
+              exit 0
+            fi
+            echo "Attempt $i: App not ready yet. Retrying in 5s..."
+            sleep 5
+          done
+
+          echo "❌ App failed to start within timeout."
+          exit 1
+
+      - name: Show container logs on failure
+        if: failure()
+        run: docker compose logs app
+
+      - name: Tear down
+        if: always()
+        run: docker compose down