add plugin library publish

src/main/kotlin/ltd.hlaeja.plugin.hlaeja-common-plugin.library-publish.gradle.kts

@@ -0,0 +1,25 @@
+import java.lang.System.getenv
+
+plugins {
+    `maven-publish`
+}
+
+publishing {
+    repositories {
+
+        fun retrieveConfiguration(
+            property: String,
+            environment: String,
+        ): String? = project.findProperty(property)?.toString() ?: getenv(environment)
+
+        maven {
+            url = uri("https://maven.pkg.github.com/swordsteel/${project.name}")
+            name = "GitHubPackages"
+            credentials {
+                username = retrieveConfiguration("repository.user", "REPOSITORY_USER")
+                password = retrieveConfiguration("repository.token", "REPOSITORY_TOKEN")
+            }
+        }
+    }
+    publications.register("mavenJava", MavenPublication::class) { from(components["java"]) }
+}

src/main/kotlin/ltd.hlaeja.plugin.hlaeja-common-plugin.library.gradle.kts

@@ -3,6 +3,7 @@ import org.springframework.boot.gradle.tasks.bundling.BootJar
 plugins {
     id("ltd.hlaeja.plugin.hlaeja-common-plugin.common")
     id("ltd.hlaeja.plugin.hlaeja-common-plugin.library-manifest")
+    id("ltd.hlaeja.plugin.hlaeja-common-plugin.library-publish")
     id("org.springframework.boot")
 }