diff --git a/.github/workflows/distros.yaml b/.github/workflows/distros.yaml
index e9c1c00..2ca33b8 100644
--- a/.github/workflows/distros.yaml
+++ b/.github/workflows/distros.yaml
@@ -16,9 +16,9 @@ permissions:
 
 jobs:
   distros:
-    uses: orglang/go-workspace/.github/workflows/distros.yaml@main
+    uses: orglang/go-workspace/.github/workflows/distros.yaml@issue-50-optimize-engine-docker-build
     with:
       engine_ref: ${{ github.event.pull_request.head.sha || github.sha }}
       sdk_ref: main
-      workspace_ref: main
-      run: ${{ github.event_name == 'merge_group' }}
+      workspace_ref: issue-50-optimize-engine-docker-build
+      run: true
diff --git a/app/main.go b/app/main.go
index c6680a2..9a12eaf 100644
--- a/app/main.go
+++ b/app/main.go
@@ -26,6 +26,7 @@ import (
 	"orglang/go-engine/app/web"
 )
 
+// Cache verification: dependency layers should be reused after the cache warm-up run.
 func main() {
 	fx.New(
 		// lib