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

Dockerfile

@@ -0,0 +1,45 @@
+# Zero OS Alpine Initramfs Builder Container
+FROM alpine:3.22
+
+# Install build dependencies
+RUN apk add --no-cache \
+    build-base \
+    rust \
+    cargo \
+    upx \
+    git \
+    wget \
+    tar \
+    gzip \
+    xz \
+    cpio \
+    binutils \
+    linux-headers \
+    musl-dev \
+    pkgconfig \
+    openssl-dev \
+    bash \
+    findutils \
+    grep \
+    sed \
+    coreutils
+
+# Add Rust musl target
+RUN rustup target add x86_64-unknown-linux-musl
+
+# Create non-root user for builds
+RUN adduser -D -s /bin/bash builder && \
+    chown -R builder:builder /home/builder
+
+# Set working directory
+WORKDIR /workspace
+
+# Set environment variables for static linking
+ENV RUSTFLAGS="-C target-feature=+crt-static"
+ENV CC_x86_64_unknown_linux_musl="musl-gcc"
+ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_MUSL_LINKER="musl-gcc"
+
+# Default to builder user
+USER builder
+
+CMD ["/bin/bash"]