flatten the "playbooks" directory for better structure

Because of how Ansible local relative search paths work, the global
"files" and "templates" directories need to be next to the playbooks.
However its not intuitive to look into the playbooks directory to find
the files and templates for a host.
Therefore flatten the playbooks directory to get rid of this confusing
structure.

Also see:
https://docs.ansible.com/ansible/latest/playbook_guide/playbook_pathing.html#resolving-local-relative-paths

templates/chaosknoten/configs/zammad/compose.yaml.j2

@@ -0,0 +1,158 @@
+---
+{#
+https://github.com/zammad/zammad-docker-compose
+Docker Compose does not allow defining variables in the compose file (only in .env files), so we use Jinja variables instead
+see https://github.com/zammad/zammad-docker-compose/blob/master/.env
+#}
+{%- set ELASTICSEARCH_VERSION = "8" | quote -%}
+{%- set IMAGE_REPO = "ghcr.io/zammad/zammad" | quote -%}
+{%- set MEMCACHE_SERVERS = "zammad-memcached:11211" | quote -%}
+{%- set MEMCACHE_VERSION = "1.6-alpine" | quote -%}
+{%- set POSTGRES_DB = "zammad_production" | quote -%}
+{%- set POSTGRES_HOST = "zammad-postgresql" | quote -%}
+{%- set POSTGRES_USER = "zammad" | quote -%}
+{%- set POSTGRES_PASS = lookup("community.general.passwordstore", "noc/vm-secrets/chaosknoten/zammad/DB_PASSWORD", create=false, missing="error") | quote -%}
+{%- set POSTGRES_PORT = "5432" | quote -%}
+{%- set POSTGRES_VERSION = "15-alpine" | quote -%}
+{%- set REDIS_URL = "redis://zammad-redis:6379" | quote -%}
+{%- set REDIS_VERSION = "7-alpine" | quote -%}
+{%- set RESTART = "always" | quote -%}
+{%- set VERSION = "6" | quote -%}
+x-shared:
+  zammad-service: &zammad-service
+    environment: &zammad-environment
+      MEMCACHE_SERVERS: {{ MEMCACHE_SERVERS }}
+      POSTGRESQL_DB: {{ POSTGRES_DB }}
+      POSTGRESQL_HOST: {{ POSTGRES_HOST }}
+      POSTGRESQL_USER: {{ POSTGRES_USER }}
+      POSTGRESQL_PASS: {{ POSTGRES_PASS }}
+      POSTGRESQL_PORT: {{ POSTGRES_PORT }}
+      REDIS_URL: {{ REDIS_URL }}
+      # Allow passing in these variables via .env:
+      AUTOWIZARD_JSON:
+      AUTOWIZARD_RELATIVE_PATH:
+      ELASTICSEARCH_ENABLED:
+      ELASTICSEARCH_HOST:
+      ELASTICSEARCH_PORT:
+      ELASTICSEARCH_SCHEMA:
+      ELASTICSEARCH_NAMESPACE:
+      ELASTICSEARCH_REINDEX:
+      ELASTICSEARCH_SSL_VERIFY:
+      NGINX_PORT:
+      NGINX_SERVER_NAME:
+      NGINX_SERVER_SCHEME: https
+      POSTGRESQL_DB_CREATE:
+      POSTGRESQL_OPTIONS:
+      RAILS_TRUSTED_PROXIES:
+      ZAMMAD_WEB_CONCURRENCY:
+      ZAMMAD_SESSION_JOBS:
+      ZAMMAD_PROCESS_SCHEDULED:
+      ZAMMAD_PROCESS_DELAYED_JOBS_WORKERS:
+    image: {{ IMAGE_REPO }}:{{ VERSION }}
+    restart: {{ RESTART }}
+    volumes:
+      - zammad-storage:/opt/zammad/storage
+      - zammad-var:/opt/zammad/var
+    depends_on:
+      - zammad-memcached
+      - zammad-postgresql
+      - zammad-redis
+
+services:
+
+  zammad-backup:
+    command: ["zammad-backup"]
+    depends_on:
+      - zammad-railsserver
+      - zammad-postgresql
+    entrypoint: /usr/local/bin/backup.sh
+    environment:
+      <<: *zammad-environment
+      BACKUP_TIME: "03:00"
+      HOLD_DAYS: "10"
+      TZ: Europe/Berlin
+    image: postgres:{{ POSTGRES_VERSION }}
+    restart: {{ RESTART }}
+    volumes:
+      - zammad-backup:/var/tmp/zammad
+      - zammad-storage:/opt/zammad/storage:ro
+      - zammad-var:/opt/zammad/var:ro
+      - ./scripts/backup.sh:/usr/local/bin/backup.sh:ro
+
+  zammad-elasticsearch:
+    image: bitnami/elasticsearch:{{ ELASTICSEARCH_VERSION }}
+    restart: {{ RESTART }}
+    volumes:
+      - elasticsearch-data:/bitnami/elasticsearch/data
+
+  zammad-init:
+    <<: *zammad-service
+    command: ["zammad-init"]
+    depends_on:
+      - zammad-postgresql
+    restart: on-failure
+    user: 0:0
+    volumes:
+      - zammad-storage:/opt/zammad/storage
+      - zammad-var:/opt/zammad/var
+
+  zammad-memcached:
+    command: memcached -m 256M
+    image: memcached:{{ MEMCACHE_VERSION }}
+    restart: {{ RESTART }}
+
+  zammad-nginx:
+    <<: *zammad-service
+    command: ["zammad-nginx"]
+    expose:
+      - "8080"
+    ports:
+      - "8080:8080"
+    depends_on:
+      - zammad-railsserver
+    volumes:
+      - zammad-var:/opt/zammad/var:ro # required for the zammad-ready check file
+
+  zammad-postgresql:
+    environment:
+      POSTGRES_DB: {{ POSTGRES_DB }}
+      POSTGRES_USER: {{ POSTGRES_USER }}
+      POSTGRES_PASSWORD: {{ POSTGRES_PASS }}
+    image: postgres:{{ POSTGRES_VERSION }}
+    restart: {{ RESTART }}
+    volumes:
+      - postgresql-data:/var/lib/postgresql/data
+
+  zammad-railsserver:
+    <<: *zammad-service
+    command: ["zammad-railsserver"]
+
+  zammad-redis:
+    image: redis:{{ REDIS_VERSION }}
+    restart: {{ RESTART }}
+    volumes:
+      - redis-data:/data
+
+  zammad-scheduler:
+    <<: *zammad-service
+    command: ["zammad-scheduler"]
+    volumes:
+      - /ansible_docker_compose/zammad-scheduler-database.yml:/opt/zammad/config/database.yml # workaround for connection pool issue
+
+  zammad-websocket:
+    <<: *zammad-service
+    command: ["zammad-websocket"]
+
+volumes:
+  elasticsearch-data:
+    driver: local
+  postgresql-data:
+    driver: local
+  redis-data:
+    driver: local
+  zammad-backup:
+    driver: local
+  zammad-storage:
+    driver: local
+  zammad-var:
+    driver: local