fix: deprecate install webhook (#1616)

Author: csviri

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/Operator.java

@@ -72,6 +72,7 @@ public Operator(KubernetesClient kubernetesClient, ConfigurationService configur
   }
 
   /** Adds a shutdown hook that automatically calls {@link #stop()} when the app shuts down. */
+  @Deprecated(forRemoval = true)
   public void installShutdownHook() {
     if (!leaderElectionManager.isLeaderElectionEnabled()) {
       Runtime.getRuntime().addShutdownHook(new Thread(this::stop));

operator-framework/src/test/java/io/javaoperatorsdk/operator/InformerRelatedBehaviorITS.java

@@ -211,7 +211,6 @@ Operator startOperator(boolean stopOnInformerErrorDuringStartup, boolean addStop
           }
         });
     operator.register(reconciler);
-    operator.installShutdownHook();
     operator.start();
     return operator;
   }

sample-operators/leader-election/src/main/java/io/javaoperatorsdk/operator/sample/LeaderElectionTestOperator.java

@@ -27,7 +27,6 @@ public static void main(String[] args) {
         new Operator(client, c -> c.withLeaderElectionConfiguration(leaderElectionConfiguration));
 
     operator.register(new LeaderElectionTestReconciler(identity));
-    operator.installShutdownHook();
     operator.start();
   }
 }

sample-operators/mysql-schema/src/main/java/io/javaoperatorsdk/operator/sample/MySQLSchemaOperator.java

@@ -34,7 +34,6 @@ public static void main(String[] args) throws IOException {
         configOverrider -> configOverrider.replacingNamedDependentResourceConfig(
             SchemaDependentResource.NAME,
             new ResourcePollerConfig(300, MySQLDbConfig.loadFromEnvironmentVars())));
-    operator.installShutdownHook();
     operator.start();
 
     new FtBasic(new TkFork(new FkRegex("/health", "ALL GOOD!")), 8080).start(Exit.NEVER);

sample-operators/tomcat-operator/src/main/java/io/javaoperatorsdk/operator/sample/TomcatOperator.java

@@ -22,7 +22,6 @@ public static void main(String[] args) throws IOException {
     Operator operator = new Operator(client);
     operator.register(new TomcatReconciler());
     operator.register(new WebappReconciler(client));
-    operator.installShutdownHook();
     operator.start();
 
     new FtBasic(new TkFork(new FkRegex("/health", "ALL GOOD.")), 8080).start(Exit.NEVER);

sample-operators/webpage/src/main/java/io/javaoperatorsdk/operator/sample/WebPageOperator.java

@@ -34,7 +34,6 @@ public static void main(String[] args) throws IOException {
     } else {
       operator.register(new WebPageStandaloneDependentsReconciler(client));
     }
-    operator.installShutdownHook();
     operator.start();
 
     new FtBasic(new TkFork(new FkRegex("/health", "ALL GOOD!")), 8080).start(Exit.NEVER);