Log explicitly requested runtime mode

For users running the nvidia-container-runtime it would be useful
to determine the runtime mode used from the logs directly instead
of relying on other log messages as signals. This change ensures
that an explicitly selected mode is also logged instead of only
when mode=auto.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

internal/info/auto.go

@@ -63,6 +63,7 @@ func ResolveAutoMode(logger logger.Interface, mode string, image image.CUDA) (rm
 // resolveMode determines the correct mode for the platform if set to "auto"
 func (r resolver) resolveMode(mode string, image image.CUDA) (rmode string) {
 	if mode != "auto" {
+		r.logger.Infof("Using requested mode '%s'", mode)
 		return mode
 	}
 	defer func() {