Installing agent on Debian with sysvinit

I tried installing the agent using the script provided in the cloud console, ie:

sudo ARCH=amd64 GCLOUD_STACK_ID=“xxx” GCLOUD_API_KEY=“xxx” GCLOUD_API_URL=“xxx” /bin/sh -c “$(curl -fsSL xxx/grafana/agent/release/production/grafanacloud-install.sh)”

but that didn’t seem to work at all. After monkeying around with the various files (the .service file, etc.), I think I figured out that I’m using sysvinit rather than systemd, ie:

dpkg -S /sbin/init
sysvinit: /sbin/init

which is what all of the documentation:

seems to support. Is there any documentation or a start up script available for sysvinit users?