NVIDIA / gpu-operator / 32538726724

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Mount host /lib/modules for precompiled drivers on SUSE

getDriverAdditionalConfigs placed the lib-modules volume and mount inside
the "if !cr.Spec.UsePrecompiledDrivers()" branch, guarded by a check for
UsePrecompiledDrivers. That inner condition can never hold there, so an
NVIDIADriver with usePrecompiled: true on sles or sl-micro rendered a
driver pod without /run/host/lib/modules.

Move the mount out to its own block after the non-precompiled branch. The
comment above it goes as well, since the guard already says precompiled
and SUSE and the volume literals already say host module tree.

The equivalent code in the ClusterPolicy path sits before the early return
for precompiled drivers and works as intended, so only the NVIDIADriver
path was affected. That is also why this went unnoticed: the tests added
with the mount only covered the ClusterPolicy path.

Add a table-driven test that renders the DaemonSet and asserts the volume
on the pod spec and the mount on nvidia-driver-ctr. Going through the
render catches a template change that stopped threading AdditionalConfigs
into the pod as well as the Go-side bug.

Fixes #2776

Signed-off-by: Abrar Shivani <ashivani@nvidia.com>

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