fix(kit): preserve source data before creation

build-sbx.sh

@@ -155,16 +155,6 @@ main() {
         done
     fi
 
-    printf 'Creating Docker sbx image: %s\n' "$new_sandbox_name"
-    if ! sbx create opencode \
-        --name "$new_sandbox_name" \
-        --kit "$KIT_PATH" \
-        --template "$TEMPLATE" \
-        "${workspace_paths[@]}"; then
-        printf 'Unable to create Docker sbx image: %s\n' "$new_sandbox_name" >&2
-        exit 1
-    fi
-
     local tmp='' api_key
     if [[ "$build_from_scratch" == false ]]; then
         tmp=$(mktemp -d) || {
@@ -178,7 +168,19 @@ main() {
                 "$selected_sandbox" >&2
             exit 1
         fi
+    fi
 
+    printf 'Creating Docker sbx image: %s\n' "$new_sandbox_name"
+    if ! sbx create opencode \
+        --name "$new_sandbox_name" \
+        --kit "$KIT_PATH" \
+        --template "$TEMPLATE" \
+        "${workspace_paths[@]}"; then
+        printf 'Unable to create Docker sbx image: %s\n' "$new_sandbox_name" >&2
+        exit 1
+    fi
+
+    if [[ "$build_from_scratch" == false ]]; then
         if ! sbx cp "$tmp/.local" "${new_sandbox_name}:/home/agent/"; then
             printf 'Unable to copy the temporary .local directory into Docker sbx image: %s\n' \
                 "$new_sandbox_name" >&2