I evaluated using systemd/zram-generator but decided against it for the following reasons:

1) it was more difficult to configure using the existing deviceinfo var
we have for zram_pct, this meant that we would ultimately couldn't have
a consistent way to configure zram stuff for all supported init systems

2) it's a Rust app, and was failing to build in CI for armv7, riscv64,
and armhf with some weird qemu crashes, failed tests, etc

3) zram-init Just Works, upstream ships a unit file for it so they
support running under systemd already
[ci:skip-build]: already built successfully in CI