feat: add a trigger example

src/main/java/io/kestra/plugin/templates/Trigger.java

@@ -0,0 +1,55 @@
+package io.kestra.plugin.templates;
+
+import io.kestra.core.models.annotations.Plugin;
+import io.kestra.core.models.conditions.ConditionContext;
+import io.kestra.core.models.executions.Execution;
+import io.kestra.core.models.triggers.*;
+import io.kestra.core.runners.RunContext;
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.*;
+import lombok.experimental.SuperBuilder;
+
+import java.time.Duration;
+import java.util.Optional;
+
+@SuperBuilder
+@ToString
+@EqualsAndHashCode
+@Getter
+@NoArgsConstructor
+@Plugin
+@Schema(
+    title = "Trigger an execution randomly",
+    description ="Trigger an execution randomly"
+)
+public class Trigger extends AbstractTrigger implements PollingTriggerInterface, TriggerOutput<Trigger.Output> {
+    @Builder.Default
+    private final Duration interval = Duration.ofSeconds(60);
+
+    protected Double min = 0.5;
+
+    @Override
+    public Optional<Execution> evaluate(ConditionContext conditionContext, TriggerContext context) {
+        double random = Math.random();
+        if (random < this.min) {
+            return Optional.empty();
+        }
+
+        RunContext runContext = conditionContext.getRunContext();
+        runContext.logger().info("Will create an execution");
+        Execution execution = TriggerService.generateExecution(
+            this,
+            conditionContext,
+            context,
+            Output.builder().random(random).build()
+        );
+
+        return Optional.of(execution);
+    }
+
+    @Builder
+    @Getter
+    public static class Output implements io.kestra.core.models.tasks.Output {
+        private Double random;
+    }
+}