XINFRA-338: Add a Gradle Enterprise cache for faster builds

* Collect custom user data
* Secure publishing
* Add new GE ignore

.gitignore

@@ -26,6 +26,9 @@ bin
 # NetBeans
 nbproject
 
+# Gradle Enterprise
+.mvn/.gradle-enterprise
+
 # Other
 *.log.*
 *.log

.mvn/extensions.xml

@@ -26,4 +26,9 @@
     <artifactId>gradle-enterprise-maven-extension</artifactId>
     <version>1.10.5</version>
   </extension>
+  <extension>
+    <groupId>com.gradle</groupId>
+    <artifactId>common-custom-user-data-maven-extension</artifactId>
+    <version>1.7.3</version>
+  </extension>
 </extensions>

.mvn/gradle-enterprise.xml

@@ -20,12 +20,14 @@
  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 -->
 
-<gradleEnterprise>
+<gradleEnterprise
+  xmlns="https://www.gradle.com/gradle-enterprise-maven" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="https://www.gradle.com/gradle-enterprise-maven https://www.gradle.com/schema/gradle-enterprise-maven.xsd">
   <server>
     <url>https://ge.xwiki.org</url>
-    <allowUntrusted>true</allowUntrusted>
   </server>
   <buildScan>
+    <publishIfAuthenticated>true</publishIfAuthenticated>
     <publish>ALWAYS</publish>
     <captureGoalInputFiles>true</captureGoalInputFiles>
     <!-- Use background scans only locally to avoid potential issues on CI (the ephemeral docker agent could terminate