Elektron Net Pool StartOS Release v4.0.4

ci(sideload): pin start-cli to pre-1.0 release instead of workspace-init

The curl install.sh script always fetches the latest start-cli, whose
1.0+ line requires a "packaging workspace" concept that this repo's
legacy Makefile/s9pk.mk plumbing doesn't support, breaking `make` with
"Uninitialized: No packaging workspace found". Rather than adding a
workspace-init step, pin to v0.4.0-beta.9 (last pre-1.0 release) by
fetching the tagged release asset directly, matching how
start9labs/shared-workflows' setup-build-env action does it for the
same legacy build pipeline.