Reverted not including build args in cache key

pkg/executor/build.go

@@ -191,6 +191,7 @@ func (s *stageBuilder) optimize(compositeKey CompositeCache, cfg v1.Config) erro
 func (s *stageBuilder) build() error {
 	// Set the initial cache key to be the base image digest, the build args and the SrcContext.
 	compositeKey := NewCompositeCache(s.baseImageDigest)
+	compositeKey.AddKey(s.opts.BuildArgs...)
 
 	// Apply optimizations to the instructions.
 	if err := s.optimize(*compositeKey, s.cf.Config); err != nil {