Clean up

Signed-off-by: Matheus Cruz <matheuscruz.dev@gmail.com>

Author: mcruzdev

impl/core/src/main/java/io/serverlessworkflow/impl/executors/RunShellExecutor.java

@@ -27,31 +27,30 @@
 import io.serverlessworkflow.impl.expressions.ExpressionUtils;
 import java.io.IOException;
 import java.io.OutputStream;
-import java.nio.file.Path;
 import java.util.Map;
 import java.util.concurrent.CompletableFuture;
 
 public class RunShellExecutor implements RunnableTask<RunShell> {
 
-  private ProcessResultSupplier processResultSupplier;
-  private CommandSupplier commandSupplier;
+  private ShellResultSupplier shellResultSupplier;
+  private ProcessBuilderSupplier processBuilderSupplier;
 
   @FunctionalInterface
-  private interface ProcessResultSupplier {
+  private interface ShellResultSupplier {
     WorkflowModel apply(
         TaskContext taskContext, ProcessBuilder processBuilder, WorkflowModel input);
   }
 
-  private interface CommandSupplier {
+  private interface ProcessBuilderSupplier {
     ProcessBuilder apply(TaskContext taskContext, WorkflowContext workflowContext);
   }
 
   @Override
   public CompletableFuture<WorkflowModel> apply(
       WorkflowContext workflowContext, TaskContext taskContext, WorkflowModel input) {
-    ProcessBuilder processBuilder = this.commandSupplier.apply(taskContext, workflowContext);
+    ProcessBuilder processBuilder = this.processBuilderSupplier.apply(taskContext, workflowContext);
     WorkflowModel workflowModel =
-        this.processResultSupplier.apply(taskContext, processBuilder, input);
+        this.shellResultSupplier.apply(taskContext, processBuilder, input);
     return CompletableFuture.completedFuture(workflowModel);
   }
 
@@ -60,7 +59,7 @@ public void init(RunShell taskConfiguration, WorkflowDefinition definition) {
     Shell shell = taskConfiguration.getShell();
     final String shellCommand = shell.getCommand();
 
-    this.commandSupplier =
+    this.processBuilderSupplier =
         (taskContext, workflowContext) -> {
           WorkflowApplication application = definition.application();
 
@@ -71,6 +70,7 @@ public void init(RunShell taskConfiguration, WorkflowDefinition definition) {
                       .apply(workflowContext, taskContext, taskContext.input())
                   : shellCommand;
 
+          // TODO: support Windows cmd.exe
           ProcessBuilder builder = new ProcessBuilder("sh", "-c", command);
 
           if (shell.getEnvironment() != null
@@ -89,12 +89,10 @@ public void init(RunShell taskConfiguration, WorkflowDefinition definition) {
             }
           }
 
-          builder.directory(Path.of(System.getProperty("user.dir")).toFile());
-
           return builder;
         };
 
-    this.processResultSupplier =
+    this.shellResultSupplier =
         (taskContext, processBuilder, input) -> {
           if (shellCommand == null || shellCommand.isBlank()) {
             throw new IllegalStateException(