Add SCM detail group (#346)

Author: janfaracik

pom.xml

@@ -57,8 +57,8 @@
   <properties>
     <changelist>999999-SNAPSHOT</changelist>
     <!-- https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/ -->
-    <jenkins.baseline>2.479</jenkins.baseline>
-    <jenkins.version>${jenkins.baseline}.1</jenkins.version>
+    <jenkins.baseline>2.504</jenkins.baseline>
+    <jenkins.version>${jenkins.baseline}.3</jenkins.version>
     <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
     <no-test-jar>false</no-test-jar>
     <hpi.compatibleSinceVersion>2.0.0</hpi.compatibleSinceVersion>
@@ -82,7 +82,7 @@
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
         <artifactId>bom-${jenkins.baseline}.x</artifactId>
-        <version>3893.v213a_42768d35</version>
+        <version>5422.v0fce72a_b_b_8cf</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>

src/main/java/jenkins/scm/api/SCMDetailGroup.java

@@ -0,0 +1,16 @@
+package jenkins.scm.api;
+
+import hudson.Extension;
+import hudson.ExtensionList;
+import jenkins.model.details.DetailGroup;
+
+/**
+ * A {@link DetailGroup} implementation that provides SCM-related details.
+ */
+@Extension(ordinal = -1)
+public class SCMDetailGroup extends DetailGroup {
+
+    public static SCMDetailGroup get() {
+        return ExtensionList.lookupSingleton(SCMDetailGroup.class);
+    }
+}