Merge pull request #13314 from flouthoc/container-commit-squash

container-commit: support `--squash` to squash layers into one if users want.

pkg/domain/entities/containers.go

@@ -154,6 +154,7 @@ type CommitOptions struct {
 	Message        string
 	Pause          bool
 	Quiet          bool
+	Squash         bool
 	Writer         io.Writer
 }