Vendor in containers/buildah v1.19.3

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/buildah/imagebuildah/stage_executor.go

@@ -834,7 +834,11 @@ func (s *StageExecutor) Execute(ctx context.Context, base string) (imgID string,
 		// Check if there's already an image based on our parent that
 		// has the same change that we're about to make, so far as we
 		// can tell.
-		if checkForLayers {
+		// Only do this if there were no build args given by the user,
+		// we need to call ib.Run() to correctly put the args together before
+		// determining if a cached layer with the same build args already exists
+		// and that is done in the if block below.
+		if checkForLayers && s.builder.Args == nil {
 			cacheID, err = s.intermediateImageExists(ctx, node, addedContentSummary, s.stepRequiresLayer(step))
 			if err != nil {
 				return "", nil, errors.Wrap(err, "error checking if cached image exists from a previous build")
@@ -1022,6 +1026,9 @@ func (s *StageExecutor) getCreatedBy(node *parser.Node, addedContentSummary stri
 		return "/bin/sh"
 	}
 	switch strings.ToUpper(node.Value) {
+	case "ARG":
+		buildArgs := s.getBuildArgs()
+		return "/bin/sh -c #(nop) ARG " + buildArgs
 	case "RUN":
 		buildArgs := s.getBuildArgs()
 		if buildArgs != "" {