Fix critical PATH issues and add related projects to README

- Fixed sfdisk PATH issue in Containerfile.base (sfdisk is in /usr/sbin)
- Updated Containerfile.minimal to use full path for grub-install
- Enhanced test-bootc-deployment.sh to properly check utility locations
- Added comprehensive section about related projects (apt-ostree, deb-bootupd, debian-bootc-corrected)
- Updated validation script to handle Debian-specific utility locations
- Improved error messages with specific solutions for PATH and utility issues

This addresses the critical requirements from scope.md regarding disk utilities
and PATH environment variables for bootc deployment.

Containerfile.server

@@ -0,0 +1,78 @@
+# Particle-OS Server Containerfile
+# Builds on the minimal image and adds server-specific packages
+# This creates the Phase 2 deliverable: Debian CoreOS equivalent
+
+FROM particle-os:minimal
+
+# Install server-specific packages
+RUN apt-get update && apt-get install -y \
+    # SSH server
+    openssh-server \
+    # Web-based management
+    cockpit \
+    cockpit-system \
+    cockpit-networkmanager \
+    # Network utilities
+    iptables \
+    ufw \
+    # Monitoring tools
+    htop \
+    iotop \
+    # Additional server utilities
+    rsync \
+    screen \
+    tmux \
+    # Server-specific OSTree packages
+    ostree-grub2 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Configure SSH
+RUN mkdir -p /var/run/sshd && \
+    echo "PermitRootLogin yes" >> /etc/ssh/sshd_config && \
+    echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config
+
+# Configure Cockpit
+RUN systemctl enable cockpit.socket && \
+    systemctl enable ssh
+
+# Set up firewall
+RUN ufw --force enable && \
+    ufw allow ssh && \
+    ufw allow 9090/tcp  # Cockpit
+
+# Update OSTree configuration for server variant
+RUN echo "OSTREE_OSVARIANT=server" >> /etc/ostree/ostree.conf && \
+    echo "OSTREE_SERVICES=ssh,cockpit" >> /etc/ostree/ostree.conf
+
+# Create server-specific OSTree deployment structure
+RUN mkdir -p /sysroot/ostree/deploy/particle-os/server/deploy && \
+    mkdir -p /sysroot/ostree/deploy/particle-os/server/var && \
+    mkdir -p /sysroot/ostree/deploy/particle-os/server/usr
+
+# Set up server-specific systemd services
+RUN systemctl enable ssh && \
+    systemctl enable cockpit.socket
+
+# Label the image with OSTree-compliant labels
+LABEL org.opencontainers.image.title="Particle-OS Server"
+LABEL org.opencontainers.image.description="Server-focused Debian immutable OS"
+LABEL org.opencontainers.image.version="0.1.0"
+LABEL org.opencontainers.image.vendor="Particle-OS Project"
+LABEL org.opencontainers.image.source="https://github.com/your-org/particle-os"
+LABEL org.opencontainers.image.revision="0.1.0"
+LABEL org.opencontainers.image.created="2024-01-01T00:00:00Z"
+LABEL org.opencontainers.image.licenses="MIT"
+LABEL org.opencontainers.image.ref.name="particle-os-server"
+LABEL org.opencontainers.image.ostree.osname="particle-os"
+LABEL org.opencontainers.image.ostree.osversion="0.1.0"
+LABEL org.opencontainers.image.ostree.osvariant="server"
+
+# Expose ports
+EXPOSE 22 9090
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD systemctl is-system-running && systemctl is-active ssh && systemctl is-active cockpit.socket || exit 1
+
+# Default command
+CMD ["/bin/bash"]