Allow to specify user_data in a template

[fernflower]

For some cases relying on a script to be passed to shell provisioner is not enough. So let's allow user to specify actual userdata to be passed to the vm on creation, this will help in complex scenarios like persistently changing network routing that will survive reboots.

[ppc64le-cloud-bot]

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[fernflower]

@mkumatag Could you please advise me on failing test https://github.com/ppc64le-cloud/packer-plugin-powervs/actions/runs/12869521195/job/35878518826?pr=267 ? I tried reproducing with go fmt locally but no luck

[mkumatag]

@mkumatag Could you please advise me on failing test https://github.com/ppc64le-cloud/packer-plugin-powervs/actions/runs/12869521195/job/35878518826?pr=267 ? I tried reproducing with go fmt locally but no luck

https://github.com/ppc64le-cloud/packer-plugin-powervs/actions/runs/12869521195/job/35878518826?pr=267 giving all the errors you need to address

[mkumatag]

For some cases relying on a script to be passed to shell provisioner is not enough. So let's allow user to specify actual userdata to be passed to the vm on creation, this will help in complex scenarios like persistently changing network routing that will survive reboots.

It will be great if you can include the sample usage of this newly introduces field in the description above.