fix: correct plugin test task path and load project metadata in docs build

Agent-Logs-Url: https://github.com/grails-plugins/grails-plugin-template/sessions/35ee8c57-f1b3-4108-844b-e65dca0b8585

Co-authored-by: sbglasius <625868+sbglasius@users.noreply.github.com>

Author: Copilot

.skills/repository-structure.md

@@ -182,7 +182,7 @@ These are available in all subprojects as project properties (`projectVersion`,
 ./gradlew build
 
 # Plugin unit tests only
-./gradlew :export:test
+./gradlew :grails-plugin-template:test
 
 # Example app integration tests
 ./gradlew :app1:integrationTest

docs/build.gradle

@@ -2,6 +2,7 @@ import org.asciidoctor.gradle.jvm.AsciidoctorTask
 
 plugins {
     id 'org.asciidoctor.jvm.convert'
+    id 'config.project-metadata'
 }
 
 version = projectVersion
@@ -17,7 +18,7 @@ def asciidoctorAttributes = [
         idprefix            : '',
         idseparator         : '-',
         version             : project.version,
-        projectUrl          : "https://github.com/${rootProject.findProperty('githubOrg')}/${rootProject.findProperty('githubProject')}",
+        projectUrl          : "https://github.com/${githubOrg}/${githubProject}",
         sourcedir           : "${rootProject.allprojects.find { it.name == 'grails-plugin-template' }.projectDir}/src/main/groovy",
         grailsVersion       : grailsVersion
 ]