feat: If the container exists, no pull is performed to speed up program execution

[soulteary]

At present, the program will try to download the latest version of the execution image every time it is started. Since we will definitely execute the image parameters during execution, we can directly start the program after checking the existence of the image without repeating the download.

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Patch Set 1: Hold+1

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Patch Set 1:

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This PR (HEAD: a6651aa) has been imported to Gerrit for code review.

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[soulteary]

continue in this pr: #18