feat: Implement complete Zero OS Alpine Initramfs Builder

- Complete bash framework with strict error handling
- Modular library system (docker, alpine, components, initramfs, kernel, testing)
- Rust component integration (zinit, rfs, mycelium) with musl targeting
- Rootless Docker/Podman support for GitHub Actions
- Centralized configuration in config/build.conf
- 2-stage module loading system
- Strip + UPX optimization for minimal size
- Complete zinit integration replacing OpenRC
- GitHub Actions CI/CD pipeline
- Comprehensive documentation and usage guides

Components:
- Latest stable kernel 6.12.44
- Alpine Linux 3.22 base
- ThreeFold components: zinit, mycelium, rfs, corex
- Target: ~8-12MB final initramfs.cpio.xz

configs/zinit/init/ashloging.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+echo "start ash terminal"
+while true; do
+    getty -l /bin/ash -n 19200 tty2
+done

configs/zinit/init/cgroup.sh

@@ -0,0 +1,10 @@
+set -x
+
+mount -t tmpfs cgroup_root /sys/fs/cgroup
+
+subsys="pids cpuset cpu cpuacct blkio memory devices freezer net_cls perf_event net_prio hugetlb"
+
+for sys in $subsys; do
+    mkdir -p /sys/fs/cgroup/$sys
+    mount -t cgroup $sys -o $sys /sys/fs/cgroup/$sys/
+done

configs/zinit/init/modprobe.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+modprobe fuse
+modprobe btrfs
+modprobe tun
+modprobe br_netfilter
+
+echo never > /sys/kernel/mm/transparent_hugepage/enabled
+
+ulimit -n 524288

configs/zinit/init/ntpd.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+ntp_flags=$(grep -o 'ntp=.*' /proc/cmdline | sed 's/^ntp=//')
+
+params=""
+if [ -n "$ntp_flags" ]; then
+  params=$(echo "-p $ntp_flags" | sed s/,/' -p '/g)
+fi
+
+exec ntpd -n $params

configs/zinit/init/routing.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+echo "Enable ip forwarding"
+echo 1 > /proc/sys/net/ipv4/ip_forward

configs/zinit/init/shm.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+mkdir /dev/shm
+mount -t tmpfs shm /dev/shm 

configs/zinit/init/sshd-setup.sh

@@ -0,0 +1,15 @@
+#!/bin/ash
+if [ -f /etc/ssh/ssh_host_rsa_key ]; then
+    # ensure existing file permissions
+    chown root:root /etc/ssh/ssh_host_*
+    chmod 600 /etc/ssh/ssh_host_*
+    exit 0
+fi
+
+echo "Setting up sshd"
+mkdir -p /run/sshd
+
+ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
+ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
+ssh-keygen -f /etc/ssh/ssh_host_ecdsa_key -N '' -t ecdsa -b 521
+ssh-keygen -f /etc/ssh/ssh_host_ed25519_key -N '' -t ed25519

configs/zinit/init/udev.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+udevadm trigger --action=add
+udevadm settle