Results before change
```
⇶ packer build /tmp/minimal.pkr.hcl
Error: 1 error occurred:
* unknown configuration key: '"user_agent"'
on /tmp/minimal.pkr.hcl line 1:
(source code not available)
==> Builds finished but no artifacts were created.
```
Results after change
```
⇶ packer build /tmp/minimal.pkr.hcl
scaleway.required: output will be in this color.
==> scaleway.required: Creating temporary ssh key for server...
==> scaleway.required: Creating server...
```