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Update #1:
Due to abusive users subverting our CI facilities to mine cryptocurrency, breaking out of the container sandbox in the process, we have been forced to take actions to limit the usage of the public runners to official projects only.
The policy will be enforced on 2023-03-23 (or before if we detect abuses).
Please see this issue for more context and to see if and how you are impacted.
A security advisory (TALOS-2019-0857/CVE-2019-5068) found that
creating shared memory regions with permission mode 0777 could allow
any user to access that memory. Several Mesa drivers use shared-
memory XImages to implement back buffers for improved performance.
This path changes the shmget() calls to use 0600 (user r/w).
Tested with legacy Xlib driver and llvmpipe.
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: 
Kristian H. Kristensen <hoegsberg@google.com>