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Ubuntu 26.04 runners currently ship Docker 29.4.2, whose default seccomp profile blocks socketcall(2) with ENOSYS (actions/runner-images#14790). Since Go on linux/386 still uses socketcall(2) for socket operations (golang/go#79200), all tests opening sockets fail with 'socket: function not implemented' when ubuntu-latest lands on ubuntu-26.04. Signed-off-by: Bartek Plotka <bwplotka@google.com>