builder/dockerfile: containerManager.RemoveAll() prevent partial cleanup

Prevent cleanup from terminating early when failing to remove a container;

- continue trying to remove remaining containers
- ignore errors due to containers that were not found

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

builder/dockerfile/containerbackend.go

@@ -10,6 +10,7 @@ import (
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/builder"
 	containerpkg "github.com/docker/docker/container"
+	"github.com/docker/docker/errdefs"
 	"github.com/docker/docker/pkg/stringid"
 	"github.com/pkg/errors"
 )
@@ -128,9 +129,9 @@ func (e *statusCodeError) StatusCode() int {
 // RemoveAll containers managed by this container manager
 func (c *containerManager) RemoveAll(stdout io.Writer) {
 	for containerID := range c.tmpContainers {
-		if err := c.backend.ContainerRm(containerID, &backend.ContainerRmConfig{ForceRemove: true, RemoveVolume: true}); err != nil {
+		if err := c.backend.ContainerRm(containerID, &backend.ContainerRmConfig{ForceRemove: true, RemoveVolume: true}); err != nil && !errdefs.IsNotFound(err) {
 			_, _ = fmt.Fprintf(stdout, "Removing intermediate container %s: %v\n", stringid.TruncateID(containerID), err)
-			return
+			continue
 		}
 		delete(c.tmpContainers, containerID)
 		_, _ = fmt.Fprintf(stdout, " ---> Removed intermediate container %s\n", stringid.TruncateID(containerID))