For headless systems, add boot entropy
What is in this article
As mentioned in Raspberry Pi - Alpine Linux under ‘Troubleshooting: Long boot time when running headless’, some systems might take an excessively long time to boot when no peripherals are attached (not only with the Pi series). In those cases it may be useful to add the rng-tools package to speed up the gathering of entropy.
Do the install
See low entropy systems hardware-specific tweaks
Don’t forgot to commit your changes
Otherwise they will be lost on reboot.