Maximilian Bosch f800d8e42b nixos/postgresql: enable private /tmp & private mounts; fix wal-receiver test ...

The issue was that the old test-case used `/tmp` to share data. Using
`JoinsNamespaceOf=` wasn't a real workaround since the private `/tmp` is
recreated when a service gets stopped/started which is the case here, so
the wals were still lost.

To keep the test building with `PrivateTmp=yes`, create a dedicated
directory in `/var/cache` with tmpfiles and allow the hardened
`postgresql.service` to access it via `ReadWritePaths`.

2024-10-01 10:31:20 +02:00

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