rollandf / doca-driver-build / 24457412921

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fix: invalidate driver cache on config changes

The inventory cache check only validated kernel version, driver version,
and an MD5 of the cached package files. It did not account for build-
affecting env vars (ENABLE_NFSRDMA, USE_DKMS, APPEND_DRIVER_BUILD_FLAGS).
Changing any of these flags while the same kernel and driver version
remained in the cache caused the stale build to be reused, resulting in
missing modules (e.g. kmod-mlnx-nfsrdma) and a failing validator daemonset.

Introduce a .buildconfig sidecar file written alongside .checksum after
every successful build. On startup, after the package checksum passes,
the stored fingerprint is compared to the current config. A mismatch or
absent fingerprint (old cache) forces a full rebuild. This covers both
the Go entrypoint (driver.go) and the legacy bash entrypoint (entrypoint.sh).

Signed-off-by: Fred Rolland <frolland@nvidia.com>

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