Quarkus fails to start if config is not a directory

[xtaixe]

Describe the bug

Quarkus fails to start if config is not a directory (both in dev mode and when running normally):

java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
	[error]: Build step io.quarkus.deployment.steps.ConfigGenerationBuildStep#unknownConfigFiles threw an exception: java.lang.IllegalStateException: java.nio.file.NotDirectoryException: /Users/xtaixe/dev/getting-started/config
	at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:858)
	at io.quarkus.builder.BuildContext.run(BuildContext.java:256)
	at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
	at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2513)
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1538)
	at java.base/java.lang.Thread.run(Thread.java:1583)
	at org.jboss.threads.JBossThread.run(JBossThread.java:501)
Caused by: java.nio.file.NotDirectoryException: /Users/xtaixe/dev/getting-started/config
	at java.base/sun.nio.fs.UnixFileSystemProvider.newDirectoryStream(UnixFileSystemProvider.java:460)
	at java.base/java.nio.file.Files.newDirectoryStream(Files.java:613)
	at io.quarkus.runtime.configuration.ConfigDiagnostic.configFiles(ConfigDiagnostic.java:185)
	at io.quarkus.runtime.configuration.ConfigDiagnostic.configFilesFromLocations(ConfigDiagnostic.java:197)
	at io.quarkus.deployment.steps.ConfigGenerationBuildStep.unknownConfigFiles(ConfigGenerationBuildStep.java:436)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:849)
	... 6 more

Expected behavior

The config file should be ignored when loading configuration and the application should start.

Actual behavior

Quarkus fails to start and throws an exception.

How to Reproduce?

mvn io.quarkus.platform:quarkus-maven-plugin:3.6.4:create -DprojectGroupId=org.acme -DprojectArtifactId=getting-started
touch config
./mvnw compile quarkus:dev

Output of uname -a or ver

Darwin Kernel Version 23.2.0: Wed Nov 15 21:53:18 PST 2023; root:xnu-10002.61.3~2/RELEASE_ARM64_T6000 arm64

Output of java -version

openjdk version "21" 2023-09-19 OpenJDK Runtime Environment GraalVM CE 21+35.1 (build 21+35-jvmci-23.1-b15) OpenJDK 64-Bit Server VM GraalVM CE 21+35.1 (build 21+35-jvmci-23.1-b15, mixed mode, sharing)

Quarkus version or git rev

3.6.4

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

Apache Maven 3.9.6

Additional information

No response

[geoand]

#37997 fixes the issue

[rsvoboda]

I hit this issue with 3.6 CLI when created app in Downloads directory which contained config file I downloaded for OCP cluster.
CLI based on Quarkus main work fine.