Add central server to settings.xml (#2978)

Author: jack-edmonds-dd

settings.xml

@@ -2,6 +2,11 @@
 <settings xsi:schemaLocation='http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd'
           xmlns='http://maven.apache.org/SETTINGS/1.0.0' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'>
     <servers>
+        <server>
+            <id>central</id>
+            <username>${env.SONATYPE_USER}</username>
+            <password>${env.SONATYPE_PASS}</password>
+        </server>
         <server>
             <id>nexus</id>
             <username>${env.SONATYPE_USER}</username>