fix(ci): expand tilde in staging deployment stack path

.gitea/workflows/build-image.yml

@@ -876,6 +876,7 @@ jobs:
           fi
           
           STACK_PATH="~/deployment/stacks/staging"
+          STACK_PATH="${STACK_PATH/#\~/$HOME}"
           
           echo "🚀 Starting staging deployment..."
           echo "   Image: ${SELECTED_IMAGE}"