Add stub for making alloy the default #29

Job	Run time
docker (prometheus, observability/prometheus, observability/prometheus/Dockerfile.prometheus, cog...	17s
docker (grafana, observability/grafana, observability/grafana/Dockerfile, cogstacksystems/cogstac...	32s
docker (traefik, observability/traefik, observability/traefik/Dockerfile, cogstacksystems/cogstac...	13s
docker (blackbox, observability/prometheus, observability/prometheus/Dockerfile.blackbox, cogstac...	17s
	1m 19s

Provide feedback