add publishing stuff

common/build.gradle.kts

@@ -2,6 +2,7 @@ import com.dfsek.terra.configureCommon
 
 plugins {
     `java-library`
+    `maven-publish`
 }
 
 configureCommon()
@@ -21,3 +22,28 @@ dependencies {
 
     "shadedApi"("com.google.guava:guava:30.0-jre")
 }
+
+publishing {
+    publications {
+        create<MavenPublication>("mavenJava") {
+            artifact(tasks["sourcesJar"])
+            artifact(tasks["jar"])
+        }
+    }
+
+    repositories {
+        val mavenUrl = "https://repo.codemc.io/repository/maven-releases/"
+        val mavenSnapshotUrl = "https://repo.codemc.io/repository/maven-snapshots/"
+
+        maven(mavenUrl) {
+            val mavenUsername: String? by project
+            val mavenPassword: String? by project
+            if (mavenUsername != null && mavenPassword != null) {
+                credentials {
+                    username = mavenUsername
+                    password = mavenPassword
+                }
+            }
+        }
+    }
+}