ci: run test image build on smb branch

Author: shoyuf

.github/workflows/test_image.yml

@@ -1,6 +1,9 @@
 name: Test Docker Image
 
 on:
+  push:
+    branches:
+      - fix/smb-session-lifecycle
   workflow_dispatch:
     inputs:
       image_tag:
@@ -126,11 +129,11 @@ jobs:
           file: Dockerfile.ci
           push: true
           build-args: |
-            BASE_IMAGE_TAG=${{ inputs.base_image_tag }}
+            BASE_IMAGE_TAG=${{ inputs.base_image_tag || 'base' }}
           tags: |
             ${{ steps.meta.outputs.image }}:${{ steps.meta.outputs.tag }}
             ${{ steps.meta.outputs.image }}:${{ github.sha }}
-          platforms: ${{ inputs.platforms }}
+          platforms: ${{ inputs.platforms || 'linux/amd64,linux/arm64' }}
 
       - name: Print image
         run: |