Update `ExportedImageTar` media type detection to support `tar+gzip`
as well as `tar.gzip`. Recent updates to Docker Desktop appear to have
changed the format.
Fixes gh-43126
Update `ExportedImageTar.IndexLayerArchiveFactory` to support nested
indexes. Nested indexes support a layer of interaction where the
`index.json` file points to a blob that contains the read index to use.
Prior to this commit, we only supported indexes provided directly by
the `index.json` file. This missing support results in "buildpack.toml:
no such file or directory" errors when referencing specific buildpacks
and using Docker Engine 27.3.1 or above.
See gh-43126
This commit adapts d44e7c9 to transforms plugin repositories using the
correct root tag. Previously, they were transformed with the regular
<repository> tag, which is invalid.
Closes gh-42687
When spring-boot-gradle-plugin is using GradleRunner, it needs to be
configured with a custom plugin classpath to account for the fact
that our Gradle plugin is on the classpath of the system classloader
but some of the other plugins would only be available on a
Gradle-created classloader. This imbalance cause class loading
problems as code in spring-boot-gradle-plugin can't see types at
runtime that are only available on the Gradle-created classloader.
To overcome this, we need to configure the GradleRunner with a custom
plugin classpath that contains both spring-boot-gradle-plugin and all
of the other plugins that are used in its various integration tests.
Previously, this was done in GradleBuild that's used by both
spring-boot-gradle-plugin and spring-boot-image-tests. This caused
a problem as spring-boot-image-tests does not have the
above-described problem and trying to correct it did not work leaving
tests that use spring-boot-gradle-plugin unable to see other plugins
such that the native image plugin.
This commit reworks the customization of the plugin classpath so that
it's only done in spring-boot-gradle-plugin's integration tests.
Closes gh-42338
This commit makes sure that integration tests for the Maven Plugin have
access to the current "spring-boot-starter-parent" pom and its
hierarchy as new integration tests rely on that.
Closes gh-42000
