Implemented helper role docker-central-database and refactored code

roles/docker-central-database/templates/services/mariadb.yml.j2

@@ -0,0 +1,22 @@
+# This template needs to be included in docker-compose.yml, which depend on a mariadb database
+{% if not enable_central_database | bool %}
+  database:
+    container_name: {{application_id}}-database
+    logging:
+      driver: journald
+    image: mariadb
+    restart: {{docker_restart_policy}}
+    env_file:
+      - mein_env_file.env
+    command: "--transaction-isolation=READ-COMMITTED --binlog-format=ROW"
+    volumes:
+      - database:/var/lib/mysql
+    healthcheck:
+      test: "/usr/bin/mariadb --user={{database_username}} --password={{database_password}} --execute \"SHOW DATABASES;\""
+      interval: 3s
+      timeout: 1s
+      retries: 5
+    networks:
+      - default
+{% endif %}
+{{ "\n" }}

roles/docker-central-database/templates/services/postgres.yml.j2

@@ -0,0 +1,21 @@
+# This template needs to be included in docker-compose.yml, which depend on a postgres database
+{% if not enable_central_database | bool %}  
+  database:
+    image: postgres:{{applications.postgres.database_version}}-alpine
+    container_name: {{application_id}}-database
+    env_file:
+      - {{database_env}}
+    restart: {{docker_restart_policy}}
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U {{database_name}}"]
+      interval: 10s
+      timeout: 5s
+      retries: 6
+    volumes:
+      - type:   volume
+        source: database
+        target: /var/lib/postgresql/data
+    networks:
+      - default
+{% endif %}
+{{ "\n" }}