You’ve actually seen this mechanism before. The # syntax= directive at the top of a Dockerfile tells BuildKit which frontend image to use. # syntax=docker/dockerfile:1 is just the default. You can point it at any image.
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。关于这个话题，WPS官方版本下载提供了深入分析
A frontend is a container image that BuildKit runs to convert your build definition (Dockerfile, YAML, JSON, HCL, whatever) into LLB. The frontend receives the build context and the build file through the BuildKit Gateway API, and returns a serialized LLB graph.
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，这一点在搜狗输入法2026中也有详细论述
实战应用：根据数据特点选择合适算法
Москвичей предупредили о резком похолодании09:45，详情可参考同城约会