Add infra to generate config sample files #4838

Job	Run time
Deduce required tests from code changes	4s
version	7s
release sterile	17m 31s
debug	7m 31s
debug sterile	12m 57s
fuzz sterile	11m 34s
v-up25.05-gw-iso-l2vni / run	41m 48s
v-gw-iso-l2vni / run	21m 27s
v-gw-iso-l3vni / run	22m 24s
h-gw-iso-l2vni / run	0s
Summary	4s
publish	0s
	2h 15m 27s

Provide feedback