Skip create docker builder if exit

[yellow-shine]

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[mergify]

⚠️ The sha of the head commit of this PR conflicts with #41. Mergify cannot evaluate rules on this PR. ⚠️

[mergify]

@samhuang-z Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/milvus-io/milvus/blob/master/CONTRIBUTING.md#developer-certificate-of-origin-dco.

[mergify]

@samhuang-z

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