Use nexus artifact manager (#7)

Author: v1v

pom.xml

@@ -274,10 +274,13 @@
         </pluginManagement>
     </build>
     <distributionManagement>
+        <snapshotRepository>
+            <id>sonatype-nexus-snapshots</id>
+            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+        </snapshotRepository>
         <repository>
-            <id>github</id>
-            <name>GitHub OWNER Apache Maven Packages</name>
-            <url>https://maven.pkg.github.com/elastic/opentelemetry-maven-extension</url>
+            <id>sonatype-nexus-staging</id>
+            <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
         </repository>
     </distributionManagement>
     <scm>