Implemented vars, tasks and templates for central database setup until mastodon role

roles/docker-pixelfed/templates/docker-compose.yml.j2

@@ -1,6 +1,11 @@
 version: '2'
 
 services:
+
+{% include 'templates/docker-{{ database_type }}-service.yml.j2' %}
+
+{% include 'templates/docker-redis-service.yml.j2' %}
+
   application:
     image: zknt/pixelfed
     restart: always
@@ -14,11 +19,8 @@ services:
       - "./env:/var/www/.env"
     ports:
       - "{{http_port}}:80"
-    depends_on:
-{% if not enable_central_database %}
-      - database
-{% endif %}
-      - redis
+{% include 'templates/docker-depends-on-central-database.yml.j2' %}
+      redis:
   worker:
     image: zknt/pixelfed
     restart: always
@@ -36,22 +38,12 @@ services:
       interval: 60s
       timeout: 5s
       retries: 1
-    depends_on:
-      - redis
-      - application
-{% if not enable_central_database %}
-    
-      - database
-
-{% include 'templates/docker-mariadb-service.yml.j2' %}
-{% endif %}
-
-{% include 'templates/docker-redis-service.yml.j2' %}
+{% include 'templates/docker-depends-on-central-database.yml.j2' %}
+      redis:
+      application:
 
 volumes:
-{% if not enable_central_database %}
-  database:
-{% endif %}
+{% include 'templates/docker-database-volume.yml.j2' %}
   redis:
   application_data:
   bootstrap: