instruction: Explain docker buildx ls
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  docker buildx ls
  Description
  List builder instances
  Usage
  docker buildx ls
  Description
  Lists all builder instances and the nodes for each instance.
  docker buildx ls
  NAME/NODE DRIVER/ENDPOINT STATUS BUILDKIT PLATFORMS
  elated_tesla* docker-container
  \_ elated_tesla0 \_ unix:///var/run/docker.sock running v0.10.3 linux/amd64
  \_ elated_tesla1 \_ ssh://ubuntu@1.2.3.4 running v0.10.3 linux/arm64*, linux/arm/v7, linux/arm/v6
  default docker
  \_ default \_ default running v0.8.2 linux/amd64
  Each builder has one or more nodes associated with it. The current builder's
  name is marked with a
  NAME/NODE
  and explicit node to build against for
  the target platform marked with a
  in the
  PLATFORMS
  column.
  Options
  Option
  Default
  Description
  --format
  table
  Format the output
  --no-trunc
  Don't truncate output
  Examples
  Format the output (--format)
  The formatting options (
  --format
  ) pretty-prints builder instances output
  using a Go template.
  Valid placeholders for the Go template are listed below:
  Placeholder
  Description
  .Name
  Builder or node name
  .DriverEndpoint
  Driver (for builder) or Endpoint (for node)
  .LastActivity
  Builder last activity
  .Status
  Builder or node status
  .Buildkit
  BuildKit version of the node
  .Platforms
  Available node's platforms
  .Error
  Error
  .Builder
  Builder object
  When using the
  --format
  option, the
  command will either output the data
  exactly as the template declares or, when using the
  table
  directive, includes
  column headers as well.
  The following example uses a template without headers and outputs the
  Name
  DriverEndpoint
  entries separated by a colon (
  docker buildx ls --format
  "{{.Name}}: {{.DriverEndpoint}}"
  elated_tesla: docker-container
  elated_tesla0: unix:///var/run/docker.sock
  elated_tesla1: ssh://ubuntu@1.2.3.4
  default: docker
  default: default
  Builder
  placeholder can be used to access the builder object and its
  fields. For example, the following template outputs the builder's and
  nodes' names with their respective endpoints:
  docker buildx ls --format
  "{{.Builder.Name}}: {{range .Builder.Nodes}}\n {{.Name}}: {{.Endpoint}}{{end}}"
  elated_tesla:
  elated_tesla0: unix:///var/run/docker.sock
  elated_tesla1: ssh://ubuntu@1.2.3.4
  default: docker
  default: default