Print buildTimestamp at startup using Quarkus and Gradle

application.properties

# custom configurations
core.build-timestamp=@buildTimestamp@

build.gradle.kts

import java.time.ZoneId
import java.time.ZonedDateTime
import java.time.format.DateTimeFormatter

tasks.named<ProcessResources>("processResources") {
        filesMatching("application.properties") {
            filter(org.apache.tools.ant.filters.ReplaceTokens::class, "tokens" to mapOf("buildTimestamp" to DateTimeFormatter.ISO_DATE_TIME.format(
                ZonedDateTime.now(ZoneId.of("Asia/Riyadh")))))
        }
        outputs.upToDateWhen { false } // disable caching
    }

CoreConfigs.java

import io.smallrye.config.ConfigMapping;

/**
 * Core configuration properties.
 * 
 * @author Fouad Almalki
 */
@ConfigMapping(prefix = "core")
public interface CoreConfigs {
    String buildTimestamp();
}