Add library/: one-command Dockerized Koha home library (WIP)

Compose stack (MariaDB + Koha built from the Koha project's Debian
packages), headless bootstrap replacing the web installer, seeded item
types and LoC Z39.50 server, and an install.sh that installs Docker,
generates passwords and waits for the site. End-to-end testing in progress.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013wi3ZSot4XbUViwRFgLpRf

library/docker-compose.yml

@@ -0,0 +1,48 @@
+name: library
+
+services:
+  db:
+    image: mariadb:10.11
+    container_name: library-db
+    restart: unless-stopped
+    environment:
+      MARIADB_ROOT_PASSWORD: ${DB_ROOT_PASSWORD}
+      MARIADB_DATABASE: koha_library
+      MARIADB_USER: koha_library
+      MARIADB_PASSWORD: ${DB_PASSWORD}
+    command: ["--character-set-server=utf8mb4", "--collation-server=utf8mb4_unicode_ci", "--innodb-buffer-pool-size=128M"]
+    volumes:
+      - db-data:/var/lib/mysql
+    healthcheck:
+      test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
+      interval: 10s
+      timeout: 5s
+      retries: 20
+
+  koha:
+    build:
+      context: ./koha
+      args:
+        KOHA_SUITE: ${KOHA_SUITE:-stable}
+    image: library-koha:local
+    container_name: library-koha
+    restart: unless-stopped
+    depends_on:
+      db:
+        condition: service_healthy
+    environment:
+      TZ: ${TZ:-UTC}
+      KOHA_DB_HOST: db
+      KOHA_DB_PASS: ${DB_PASSWORD}
+      KOHA_ADMIN_USER: ${ADMIN_USER:-admin}
+      KOHA_ADMIN_PASS: ${ADMIN_PASSWORD}
+      KOHA_LIBRARY_NAME: ${LIBRARY_NAME:-My Library}
+    ports:
+      - "${OPAC_PORT:-8080}:80"
+      - "${STAFF_PORT:-8081}:8081"
+    volumes:
+      - koha-data:/var/lib/koha
+
+volumes:
+  db-data:
+  koha-data: