Ensure that attach ready channel does not block #8175
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We only use this channel in terminal attach, and it was not a buffered channel originally, so it would block on trying to send unless a receiver was ready. In the non-terminal case, there was no receiver, so attach blocked forever. Buffer the channel for a single bool so that it will never block, even if unused. Fixes containers#8154 Signed-off-by: Matthew Heon <mheon@redhat.com>
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We only use this channel in terminal attach, and it was not a buffered channel originally, so it would block on trying to send unless a receiver was ready. In the non-terminal case, there was no receiver, so attach blocked forever. Buffer the channel for a single bool so that it will never block, even if unused.
Fixes #8154