build: add pomchecker plugin to make sure the POM is valid for publishing

Author: poikilotherm

pom.xml

@@ -47,6 +47,7 @@
     <maven-release-plugin.version>3.0.1</maven-release-plugin.version>
     <maven-enforcer-plugin.version>3.4.1</maven-enforcer-plugin.version>
 
+    <pomchecker-maven-plugin.version>1.7.0</pomchecker-maven-plugin.version>
     <nexus-staging-plugin.version>1.6.13</nexus-staging-plugin.version>
     <jacoco.version>0.8.12</jacoco.version>
     <spotless.version>2.43.0</spotless.version>
@@ -152,6 +153,11 @@
           <artifactId>flatten-maven-plugin</artifactId>
           <version>${maven-flatten-plugin.version}</version>
         </plugin>
+        <plugin>
+          <groupId>org.kordamp.maven</groupId>
+          <artifactId>pomchecker-maven-plugin</artifactId>
+          <version>${pomchecker-maven-plugin.version}</version>
+        </plugin>
         <plugin>
           <groupId>org.sonatype.plugins</groupId>
           <artifactId>nexus-staging-maven-plugin</artifactId>
@@ -171,6 +177,10 @@
           <release>${jdk.version}</release>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.kordamp.maven</groupId>
+        <artifactId>pomchecker-maven-plugin</artifactId>
+      </plugin>
       <plugin>
         <groupId>org.sonatype.plugins</groupId>
         <artifactId>nexus-staging-maven-plugin</artifactId>