Allow customizing the image name for alpine ( used to get docker uid)

[bhiravabhatla]

Are you certain it's a bug?

• [X] Yes, it looks like a bug

Are you using the latest plugin release?

• [X] Yes, I'm using the latest plugin release

Is there an existing issue for this?

• [X] I have searched existing issues, it hasn't been reported yet

Issue description

Using python requirements to develop in a airgapped environment. Before the pip dependencies are downloaded - we check for docker uid by using alpine image here - https://github.com/serverless/serverless-python-requirements/blob/4bbb80ed0c0150e04696513f37537eb3ab0002a4/lib/docker.js#L195

As there is no way to override this image - image name is hardcoded - unable to proceed. Deployment fails with docker error 125.

As a work around for now if retag the image from our registry to alpine:latest locally - it proceeds. But cant do the same in CI. Please help!

Service configuration (serverless.yml) content

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Command name and used flags

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Command output

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Environment information

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