amazon-ebs: failed to get shared config profile, default #13533

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#### Overview of the Issue

The new version 1.8.0 is producing this error,

```
[Container] 2025/11/19 14:42:32.000162 Running command packer plugins install github.com/hashicorp/amazon
--
Installed plugin github.com/hashicorp/amazon v1.8.0 in "/root/.config/packer/plugins/github.com/hashicorp/amazon/packer-plugin-amazon_v1.8.0_x5.0_linux_amd64"
 
[Container] 2025/11/19 14:42:34.784512 Running command packer build -timestamp-ui -var-file=variables-staging.json ami-code.json
amazon-ebs: output will be in this color.
 
2025-11-19T14:42:35Z: Build 'amazon-ebs' errored after 841 microseconds: failed to get shared config profile, default
 
==> Wait completed after 884 microseconds
 
==> Some builds didn't complete successfully and had errors:
--> amazon-ebs: failed to get shared config profile, default
 
==> Builds finished but no artifacts were created.
```

#### Reproduction Steps

I'm not sure our config is pretty straight forward

```json
"builders": [
{
"type": "amazon-ebs",
"profile": "default",
"region": "{{user `region` }}",
...
```

### Packer version

From `1.8.0`.

`1.7.1` is fine, so we fixed to that version as a workaround.