vm: enable isolated System V IPC for sandboxed actions - #41
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PostgreSQL initialization inside an actiond action currently fails with: ```text FATAL: could not create shared memory segment: Function not implemented DETAIL: Failed system call was shmget(key=4140, size=56, 03600). ``` Enable System V IPC and IPC namespaces in both supported guest-kernel configurations, and give every action its own IPC namespace. Isolating IPC at the action boundary prevents shared-memory segments, semaphore sets, and message queues from leaking between unrelated executions. Extend the existing clone-flags test to cover IPC namespace isolation. Both architecture configurations resolve through the real Linux Kconfig parser. The ARM64 guest kernel and initramfs build through actiond, and the original PostgreSQL/pgvector integration test passes against the rebuilt guest.
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PostgreSQL initialization inside an actiond action currently fails with:
Enable System V IPC and IPC namespaces in both supported guest-kernel
configurations, and give every action its own IPC namespace. Isolating IPC at
the action boundary prevents shared-memory segments, semaphore sets, and
message queues from leaking between unrelated executions.
Extend the existing clone-flags test to cover IPC namespace isolation. Both
architecture configurations resolve through the real Linux Kconfig parser. The
ARM64 guest kernel and initramfs build through actiond, and the original
PostgreSQL/pgvector integration test passes against the rebuilt guest.