Environment variable for certificateChain not supported

IntelliJ Platform Gradle Build Scripts
1
Tool Version
Gradle 8.11.1
IntelliJ Platform Gradle Plugin 2.7.0

When trying to configure the plugin signing task using environment variables, passing the raw certificate content to certificateChain.set() fails with Invalid argument, whereas pointing to a file works.

Example that fails:

signing {
    certificateChain.set(System.getenv("CERTIFICATE_CHAIN"))
    privateKey.set(System.getenv("PRIVATE_KEY"))
    password.set(System.getenv("PRIVATE_KEY_PASSWORD"))
}

Error:

Invalid argument: -----BEGIN CERTIFICATE-----
MIIF5zCCA8+gAwIBAgIU...

Example that works:

signing {
    certificateChainFile = file("/Users/.../chain.crt") // path to file
    privateKey.set(System.getenv("PRIVATE_KEY"))
    password.set(System.getenv("PRIVATE_KEY_PASSWORD"))
}

Shouldn’t it be possible to pass the certificate content via an environment variable (multi-line string) without having to write it to a file manually?

Steps to reproduce

Set an environment variable CERTIFICATE_CHAIN with the full multi-line certificate content.
Configure signing using certificateChain.set(System.getenv(“CERTIFICATE_CHAIN”)).
Run ./gradlew verifyPluginSignature.