fix(ci): 镜像构建仅由打 tag 触发，移除 push to main 触发

之前推送到 main 分支也会构建并推送镜像，
改为仅通过 release workflow（打 tag）或手动 dispatch 触发。

Made-with: Cursor

Author: ZaneL1u

.github/workflows/build-images.yml

@@ -1,8 +1,6 @@
 name: Build and Push Images
 
 on:
-  push:
-    branches: ["main"]
   workflow_call:
     inputs:
       version:
@@ -70,7 +68,7 @@ jobs:
             type=semver,pattern={{major}},value=${{ inputs.version }},enable=${{ inputs.version != '' }}
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
-            type=raw,value=latest,enable=${{ inputs.version != '' || github.ref_name == github.event.repository.default_branch }}
+            type=raw,value=latest,enable=${{ inputs.version != '' }}
 
       - name: Build and push
         uses: docker/build-push-action@v6