fix(cdk-assets): propagate buildSsh flag to docker build

[JackWBoynton]

A few weeks ago I added the --ssh flag to the constructs for building a cdk with that arg; However, I missed actually passing that arg to the docker.build in the cdk-assets container-images. This adds that arg where it should be.

Closes 12062.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 54444b4
• Result: SUCCEEDED
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[liqMats]

Thank you @JackWBoynton. This helps us a lot!