[Bug] v0.15.0 Docker image: stage2-hook.sh, main-wrapper.sh missing; container_boot module removed

The official v0.15.0 Docker image fails to start with exit code 127: two init scripts (stage2-hook.sh, main-wrapper.sh) present in source but missing from the built image, plus a reference to the hermes_cli.container_boot module that was removed in the v0.15.0 refactor. Issue is closed as fixed.