fix(ecr-assets): improved compatiblity of TarballImageAsset with different docker versions

[ajaest]

Issue

Closes #33428

Reason for this change

The problem seems to be the sed expression used here, that expects docker load output to match the expression Loaded image: <digest>.

However, in the attached docker version docker load actually prints Loaded image ID: <digest>.

Just changing the sed expression from sed "s/Loaded image: //g" to sed "s/Loaded image[^:]*: //g" or similar should work for every scenario. For example:

$> echo 'Loaded image ID: sha256:4a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a'| sed  "s/Loaded image[^:]*: //g"
sha256:4a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a

$> echo 'Loaded image: sha256:4a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a'| sed  "s/Loaded image[^:]*: //g"
sha256:4a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a

Description of changes

Changed the sed expression to obtain the imported tarball digest from sed "s/Loaded image: //g" to sed "s/Loaded image[^:]*: //g"

Describe any new or updated permissions being added

No permissions addeed

Description of how you validated changes

I run the sed expression against the original expected output and the one from the latest docker clients:

$> echo 'Loaded image ID: sha256:4a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a'| sed  "s/Loaded image[^:]*: //g"
sha256:4a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a

$> echo 'Loaded image: sha256:4a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a'| sed  "s/Loaded image[^:]*: //g"
sha256:4a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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