Node wrapper per engine (rerun tests when the engine changes)

Author: vouillon

tools/dune

@@ -12,6 +12,13 @@
    %{target}
    (run echo "let engine = \"%{env:WASM_ENGINE=node}\""))))
 
+(rule
+ (target node_wrapper_per_engine.ml)
+ (action
+  (with-stdout-to
+   %{target}
+   (run echo "let engine = \"%{env:WASM_ENGINE=node}\""))))
+
 (executable
  (name ci_setup)
  (modules ci_setup)