fix: get pid of container directly

container/container_delete.go

@@ -4,18 +4,22 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"syscall"
 
 	"github.com/nixpig/brownie/cgroups"
-	"golang.org/x/sys/unix"
 )
 
 func (c *Container) Delete(force bool) error {
 	if !force && !c.CanBeDeleted() {
 		return fmt.Errorf("container cannot be deleted in current state (%s)", c.Status())
 	}
 
-	if err := c.Kill(unix.SIGKILL); err != nil {
-		return fmt.Errorf("send sigkill to container: %w", err)
+	process, err := os.FindProcess(c.PID())
+	if err != nil {
+		return fmt.Errorf("find container process (%d): %w", c.PID(), err)
+	}
+	if process != nil {
+		process.Signal(syscall.Signal(9))
 	}
 
 	if err := cgroups.DeleteV1(c.Spec.Linux.CgroupsPath); err != nil {