docs custom image packer topic page

[powellquiring]

https://cloud.ibm.com/docs/vpc?topic=vpc-planning-custom-images&interface=ui#custom-image-creation

The page mentions packer:

Packer is like terraform in that IBM provides a supported plugin to the packer tool.

Expected: A topic page that answers a few basic questions about packer with links to the packer docs at hashicorp and IBM plugin information with a getting started and a simple full example in github that can be used.

[amatetic]

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