gradle multi module project build fails when quarkus.bootstrap.workspace-discovery is enabled

[keitaf]

Describe the bug

After upgrading Quarkus to 3.0.3, my multi-module gradle project fails to build with the following error when quarkus.bootstrap.workspace-discovery is set as true.

❯  ./gradlew clean build

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:quarkusBuild'.
> Could not copy file '/.../multi-module/code-with-quarkus/app/build/quarkus-build/dep/lib/main/org.acme.main' to '/.../multi-module/code-with-quarkus/app/build/quarkus-app/lib/main/org.acme.main'.
   > Cannot create directory '/.../multi-module/code-with-quarkus/app/build/quarkus-app/lib/main/org.acme.main' as it already exists, but is not a directory

INFO logs show that the build fails at quarkusBuild task.

> Task :app:quarkusBuild FAILED
Caching disabled for task ':app:quarkusBuild' because:
  Build cache is disabled
Task ':app:quarkusBuild' is not up-to-date because:
  Task has failed previously.
Removing output files and directories (provide a clean state).
Synchronizing Quarkus build for jar packaging from /.../multi-module/code-with-quarkus/app/build/quarkus-build/app/quarkus-app and /.../multi-module/code-with-quarkus/app/build/quarkus-build/dep into /.../multi-module/code-with-quarkus/app/build/quarkus-app

If I set quarkus.bootstrap.workspace-discovery to false, the project builds successfully.

Expected behavior

./gradlew build finishes successfully.

Actual behavior

./gradlew build fails with the above error.

How to Reproduce?

1. download and unzip project.zip
2. cd code-with-quarkus
3. run ./gradlew clean build twice

Output of uname -a or ver

Darwin KEFUJII-M-Q636 22.4.0 Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:17 PST 2023; root:xnu-8796.101.5~3/RELEASE_X86_64 x86_64

Output of java -version

openjdk version "18.0.2.1" 2022-08-18

GraalVM version (if different from Java)

No response

Quarkus version or git rev

3.0.3

Build tool (ie. output of mvnw --version or gradlew --version)

Gradle 8.1

Additional information

No response

[quarkus-bot]

/cc @glefloch, @quarkusio/devtools