nixos/amazon-image: Enable Amazon SSM Agent by default

Amazon-provided EC2 images do this.

See: https://docs.aws.amazon.com/systems-manager/latest/userguide/ami-preinstalled-agent.html

Changed files
+6
nixos
doc
manual
release-notes
modules
virtualisation
+2
nixos/doc/manual/release-notes/rl-2405.section.md
···
- [Lilypond](https://lilypond.org/index.html) and [Denemo](https://www.denemo.org) are now compiled with Guile 3.0.
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- The EC2 image module now enables the [Amazon SSM Agent](https://docs.aws.amazon.com/systems-manager/latest/userguide/ssm-agent.html) by default.
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- The following options of the Nextcloud module were moved into [`services.nextcloud.settings`](#opt-services.nextcloud.settings) and renamed to match the name from Nextcloud's `config.php`:
- `logLevel` -> [`loglevel`](#opt-services.nextcloud.settings.loglevel),
- `logType` -> [`log_type`](#opt-services.nextcloud.settings.log_type),
+4
nixos/modules/virtualisation/amazon-image.nix
···
serviceConfig.StandardOutput = "journal+console";
};
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# Amazon-issued AMIs include the SSM Agent by default, so we do the same.
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# https://docs.aws.amazon.com/systems-manager/latest/userguide/ami-preinstalled-agent.html
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services.amazon-ssm-agent.enable = true;
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# Allow root logins only using the SSH key that the user specified
# at instance creation time.
services.openssh.enable = true;