构建步骤的嵌套深度。
构建过程分为多个步骤，而这些步骤本身可能又递归地分为多个子步骤。嵌套深度表明此步骤中包含多少个较高级别的构建步骤。代表整体构建过程的步骤的深度为 0，该步骤的子步骤的深度为 1，依此类推。
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