ImagePlatform can cause "OS must not be empty" IllegalArgumentException

[philwebb]

Caused by: java.lang.IllegalArgumentException: OS must not be empty
	at org.springframework.util.Assert.hasText(Assert.java:253)
	at org.springframework.boot.buildpack.platform.docker.type.ImagePlatform.<init>(ImagePlatform.java:38)
	at org.springframework.boot.buildpack.platform.docker.type.ImagePlatform.from(ImagePlatform.java:99)
	at org.springframework.boot.buildpack.platform.build.Builder$ImageFetcher.checkPlatformMismatch(Builder.java:265)
	at org.springframework.boot.buildpack.platform.build.Builder$ImageFetcher.fetchImage(Builder.java:239)
	at org.springframework.boot.buildpack.platform.build.Builder.build(Builder.java:107)
	at org.springframework.boot.gradle.tasks.bundling.BootBuildImage.buildImage(BootBuildImage.java:364)
	at jdk.internal.reflect.GeneratedMethodAccessor1256.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

Looks like something may have changed with Docker since I get:

$ docker inspect ghcr.io/spring-io/spring-boot-cnb-test-builder:0.0.1
[
    {
        "Id": "sha256:21635a6b4880772f3fabbf8b660907fa38636558cf787cc26f1779fc4b4e2cba",
        "RepoTags": [
            "ghcr.io/spring-io/spring-boot-cnb-test-builder:0.0.1"
        ],
        "RepoDigests": [
            "ghcr.io/spring-io/spring-boot-cnb-test-builder@sha256:21635a6b4880772f3fabbf8b660907fa38636558cf787cc26f1779fc4b4e2cba"
        ],
        "Parent": "",
        "Comment": "",
        "DockerVersion": "",
        "Author": "",
        "Config": null,
        "Architecture": "",
        "Os": "",
        "Size": 166797518,
        "GraphDriver": {
            "Data": null,
            "Name": "overlayfs"
        },
        "RootFS": {},
        "Metadata": {
            "LastTagTime": "2025-04-10T22:41:27.520294922Z"
        },
        "Descriptor": {
            "mediaType": "application/vnd.oci.image.index.v1+json",
            "digest": "sha256:21635a6b4880772f3fabbf8b660907fa38636558cf787cc26f1779fc4b4e2cba",
            "size": 513
        }
    }
]

Note that Os is now an empty string.