allow root volume tagging (aws ec2) in cloud map for salt-cloud

[thetoolsmith]

Volume tagging can be set in cloud map as implemented in this change: #18451

However, tagging of root volume in the cloud map is not possible.
I have tried a couple of different tests.

1. duplicate the block_device_mappings volume config in the volumes: {} block. This creates two volumes and fails to attach one.
2. add tagging directly to the block_device_mappings block, no success here either.

In our automation we have to get return metadata from AWS, do an instance/root vol lookup and then add a tag. This is a lot of extra code to workaround.

[gtmanfred]

I am marking this as a feature request.

Daniel

[thetoolsmith]

thank you.

[stale]

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