The runner host is Alpine (OpenRC, no systemd). Add an OpenRC init script
for act_runner (supervise-daemon, depends on docker) plus a conf.d
example for running one instance per project, and rewrite the runner
section of the README with Alpine setup steps (apk docker, dedicated user
in the docker group, register, service install).
Assisted-By: Claude Code (claude-opus-4)
Claude-Session: https://claude.ai/code/session_01NFpGtGTWUEYXLwZeZs2RAV
Signed-off-by: Stan Grams <sjg@haxx.space>
