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

config/build.conf

@@ -0,0 +1,46 @@
+# Zero OS Alpine Initramfs Builder Configuration
+# This file contains all build-time configuration parameters
+
+# System versions
+ALPINE_VERSION="3.22"
+KERNEL_VERSION="6.12.44"
+
+# Rust configuration
+RUST_TARGET="x86_64-unknown-linux-musl"
+
+# Build optimization
+OPTIMIZATION_LEVEL="max"
+
+# Container configuration
+CONTAINER_RUNTIME="auto"
+BUILDER_IMAGE="zero-os-builder:latest"
+
+# Compression settings
+INITRAMFS_COMPRESSION="xz"
+XZ_COMPRESSION_LEVEL="9"
+
+# Testing configuration
+QEMU_MEMORY="512M"
+QEMU_TIMEOUT="60"
+CLOUD_HYPERVISOR_MEMORY="512M"
+
+# Build directories (relative to project root)
+INSTALL_DIR="initramfs"
+COMPONENTS_DIR="components"
+KERNEL_DIR="kernel"
+DIST_DIR="dist"
+
+# Mirror configurations
+ALPINE_MIRROR="https://dl-cdn.alpinelinux.org/alpine"
+KERNEL_SOURCE_URL="https://cdn.kernel.org/pub/linux/kernel"
+
+# Feature flags
+ENABLE_STRIP="true"
+ENABLE_UPX="true"
+ENABLE_AGGRESSIVE_CLEANUP="true"
+ENABLE_2STAGE_MODULES="true"
+
+# Debug and development
+DEBUG_DEFAULT="0"
+KEEP_BUILD_ARTIFACTS="false"
+PARALLEL_JOBS="auto"