Add publishing (#13)

Signed-off-by: Sayali Gaikawad <gaiksaya@amazon.com>

build.gradle

@@ -54,6 +54,7 @@ allprojects {
 
 apply plugin: 'opensearch.opensearchplugin'
 apply plugin: 'opensearch.internal-cluster-test'
+apply plugin: 'opensearch.pluginzip'
 
 opensearchplugin {
   name 'opensearch-custom-codecs'
@@ -67,6 +68,40 @@ dependencies {
   api "com.github.luben:zstd-jni:1.5.5-5"
 }
 
+publishing {
+    publications {
+        pluginZip(MavenPublication) { publication ->
+            pom {
+                name = opensearchplugin.name
+                description = opensearchplugin.description
+                groupId = "org.opensearch.plugin"
+                licenses {
+                    license {
+                        name = "The Apache License, Version 2.0"
+                        url = "http://www.apache.org/licenses/LICENSE-2.0.txt"
+                    }
+                }
+                developers {
+                    developer {
+                        name = "OpenSearch"
+                        url = "https://github.com/opensearch-project/index-management"
+                    }
+                }
+            }
+        }
+    }
+    repositories {
+        maven {
+            name = "Snapshots"
+            url = "https://aws.oss.sonatype.org/content/repositories/snapshots"
+            credentials {
+                username "$System.env.SONATYPE_USERNAME"
+                password "$System.env.SONATYPE_PASSWORD"
+            }
+        }
+    }
+}
+
 // ignore missing javadocs
 tasks.withType(Javadoc).configureEach { Javadoc javadoc ->
   // the -quiet here is because of a bug in gradle, in that adding a string option