Hovis builds a garden office*

Drill, countersink and screw the track to the cladding. Three screws over 2.8m should be enough. It’ll be weird drilling the track but it’s just aluminium and it’ll actually add function. I’d just fill the holes after but if you’re really precious you could screw the track to a sacrificial board flat against the cladding, bottom edge resting on the ground, then cut through it to the cladding.

Thinking about it, you could do the same thing but clamp to the board. Probs have to do it in three cuts though to avoid too much track sag. Also, watch out for the blade getting pinched.