Cannot add dependencies

[monandszy]

this gradle.build:
dependencies {
docker("library:caddy:2.8.4-alpine")
}

compose-template.yml
services:
caddy:
image: caddy:{{library:caddy}}
is not resolved correctly no matter what dependency I try

Task :app:generateDockerCompose FAILED
Resolving Docker template dependencies from configuration docker...
Resolving global dependency management for project 'app'
Resource missing. [HTTP GET: https://repo.maven.apache.org/maven2/library/caddy/2.8.4-alpine/caddy-2.8.4-alpine.pom]
Excluding []

Execution failed for task ':app:generateDockerCompose'.

Error while evaluating property 'moduleDependencies' of task ':app:generateDockerCompose'.
Could not resolve all dependencies for configuration ':app:docker'.
> Could not find library:caddy:2.8.4-alpine.
Required by:
project :app

is it even supposed to behave this way, or did I configure something wrong?