test(01-05): add minimal ISO build test profile and script

- Minimal archiso profile (base + linux only)
- Test script runs build in container sandbox
- Verifies end-to-end ISO generation pipeline

Usage: ./scripts/test-iso-build.sh

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/test-iso-build.sh

@@ -0,0 +1,75 @@
+#!/bin/bash
+# Test ISO build using the container sandbox
+# Creates a minimal Arch ISO to verify the build pipeline works
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+
+# Configuration
+PROFILE_DIR="$PROJECT_ROOT/tests/fixtures/archiso-test-profile"
+OUTPUT_DIR="$PROJECT_ROOT/tmp/iso-test-output"
+BUILD_IMAGE="debate-archiso-builder:latest"
+
+log() {
+    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1"
+}
+
+# Detect container runtime
+if command -v podman &> /dev/null; then
+    RUNTIME="podman"
+elif command -v docker &> /dev/null; then
+    RUNTIME="docker"
+else
+    log "ERROR: No container runtime found. Install podman or docker."
+    exit 1
+fi
+
+log "Using runtime: $RUNTIME"
+
+# Check if build image exists
+if ! $RUNTIME image inspect "$BUILD_IMAGE" &> /dev/null; then
+    log "Build image not found. Run: ./scripts/setup-sandbox.sh"
+    exit 1
+fi
+
+# Create output directory
+mkdir -p "$OUTPUT_DIR"
+log "Output directory: $OUTPUT_DIR"
+
+# Run the build
+log "Starting ISO build (this may take several minutes)..."
+log "Profile: $PROFILE_DIR"
+
+$RUNTIME run \
+    --name debate-test-build \
+    --rm \
+    --network=none \
+    --privileged \
+    --tmpfs=/tmp:exec,mode=1777 \
+    --tmpfs=/var/tmp:exec,mode=1777 \
+    -v "$PROFILE_DIR:/build/profile:ro" \
+    -v "$OUTPUT_DIR:/build/output:rw" \
+    -e SOURCE_DATE_EPOCH=1704067200 \
+    -e LC_ALL=C \
+    -e TZ=UTC \
+    "$BUILD_IMAGE" \
+    mkarchiso -v -w /tmp/archiso-work -o /build/output /build/profile
+
+# Check result
+if ls "$OUTPUT_DIR"/*.iso &> /dev/null; then
+    ISO_FILE=$(ls "$OUTPUT_DIR"/*.iso | head -1)
+    ISO_SIZE=$(du -h "$ISO_FILE" | cut -f1)
+    log "SUCCESS! ISO created: $ISO_FILE ($ISO_SIZE)"
+    log ""
+    log "To verify the ISO:"
+    log "  sha256sum $ISO_FILE"
+    log ""
+    log "To test in a VM:"
+    log "  qemu-system-x86_64 -cdrom $ISO_FILE -m 2G -enable-kvm"
+else
+    log "ERROR: No ISO file found in output directory"
+    log "Check the build output above for errors"
+    exit 1
+fi

tests/fixtures/archiso-test-profile/packages.x86_64

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+base
+linux
+mkinitcpio

tests/fixtures/archiso-test-profile/pacman.conf

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+[options]
+Architecture = auto
+CheckSpace
+SigLevel = Required DatabaseOptional
+LocalFileSigLevel = Optional
+
+[core]
+Include = /etc/pacman.d/mirrorlist
+
+[extra]
+Include = /etc/pacman.d/mirrorlist

tests/fixtures/archiso-test-profile/profiledef.sh

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+#!/usr/bin/env bash
+# Minimal test profile for Debate ISO builds
+
+iso_name="debate-test"
+iso_label="DEBATE_TEST"
+iso_publisher="Debate Platform <https://debate.example.com>"
+iso_application="Debate Test ISO"
+iso_version="test"
+install_dir="arch"
+buildmodes=('iso')
+bootmodes=('bios.syslinux.mbr' 'bios.syslinux.eltorito')
+arch="x86_64"
+pacman_conf="pacman.conf"
+airootfs_image_type="squashfs"
+airootfs_image_tool_options=('-comp' 'xz' '-b' '1M')