containers/attach: Note bug around goroutine leak

See:

- containers/podman-bootc#59 (comment)
- containers/podman-bootc#61

Sorry for not trying to fix this, but I am not aware of
a remotely straightforward way to do so.

Signed-off-by: Colin Walters <[email protected]>

pkg/bindings/containers/attach.go

@@ -29,7 +29,10 @@ type CloseWriter interface {
 	CloseWrite() error
 }
 
-// Attach attaches to a running container
+// Attach attaches to a running container.
+//
+// NOTE: When the container is configured to use a tty and stdin is a tty,
+// this currently leaks a goroutine reading from stdin even if the ctx is cancelled.
 func Attach(ctx context.Context, nameOrID string, stdin io.Reader, stdout io.Writer, stderr io.Writer, attachReady chan bool, options *AttachOptions) error {
 	if options == nil {
 		options = new(AttachOptions)