renovate/lib/modules/manager/buildpacks/readme.md

The buildpacks manager updates Cloud Native Buildpacks project descriptors in project.toml files. A project.toml file can reference builder / buildpack images by URIs. Renovate can update a project.toml file if:

• It can find the file
• The file follows the project descriptor specifications
• The buildpack uri is an OCI image reference (references to a local file or buildpack registry are ignored)

If you use buildpacks in the io.buildpacks.group array, then you must configure the Docker reference (uri) for Renovate to work.

[_]
schema-version = "0.2"

[io.buildpacks]
builder = "registry.corp/builder/noble:1.1.1"

[[io.buildpacks.group]]
uri = "docker://buildpacks/java:2.2.2"

[[io.buildpacks.group]]
uri = "buildpacks/nodejs:3.3.3"

[[io.buildpacks.group]]
uri = "file://local.oci" # will be ignored