Fix ImageChange triggers not being set in DeploymentConfig when resource fragments are used.

CHANGELOG.md

@@ -26,6 +26,7 @@ Usage:
 * Fix #1789: script to extract changelog information for notifications
 * Fix #1770: Fixed my mistake, remove constructors from OpenshiftBuildConfig which were causing PluginConfigurationException
 * Fix #1791: Fix NullPointerException in FileDataSecretEnricher (due to recent change in Kubernetes Client Builder null to LinkedHashMap conversion)
+* Fix: ImageChangeTags not being applied in DeploymentConfig generated by plugin in case of resource fragments. (Issue found in [this](https://stackoverflow.com/questions/60375063) StackOverflow post.)
 
 ### 4.4.0 (2020-02-13)
 * Fix #1572: Support maven --batch-mode option

core/src/main/java/io/fabric8/maven/core/util/kubernetes/KubernetesResourceUtil.java

@@ -723,6 +723,8 @@ public static String mergePodSpec(PodSpecBuilder builder, PodSpec defaultPodSpec
     }
 
     public static String mergePodSpec(PodSpecBuilder builder, PodSpec defaultPodSpec, String defaultName, boolean sidecarEnabled) {
+        // The default application container name is needed by plugin in order
+        // to add ImageChange triggers in case of DeploymentConfig
         String defaultApplicationContainerName = null;
         List<Container> containers = builder.buildContainers();
         List<Container> defaultContainers = defaultPodSpec.getContainers();
@@ -753,6 +755,11 @@ public static String mergePodSpec(PodSpecBuilder builder, PodSpec defaultPodSpec
                             container = new Container();
                             containers.add(container);
                         }
+                        // If default container name is not set, add first found
+                        // container as default application container.
+                        if (defaultApplicationContainerName == null) {
+                            defaultApplicationContainerName = container.getName();
+                        }
                     }
 
                     mergeSimpleFields(container, defaultContainer);