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

templates/docker-database-volume.yml.j2

@@ -0,0 +1,3 @@
+{% if not enable_central_database %}
+  database:
+{% endif %}

templates/docker-depends-on-central-database.yml.j2

@@ -0,0 +1,5 @@
+{% if enable_central_database %}
+    depends_on:
+      database:
+		    condition: service_healthy
+{% endif %}

templates/docker-mariadb-service.yml.j2

@@ -1,3 +1,4 @@
+{% if not enable_central_database %}
   database:
     logging:
       driver: journald
@@ -16,4 +17,7 @@
       test: "/usr/bin/mariadb --user={{database_username}} --password={{database_password}} --execute \"SHOW DATABASES;\""
       interval: 3s
       timeout: 1s
-      retries: 5
+      retries: 5
+    networks:
+      - {{docker_compose_project_name}}_network
+{% endif %}

templates/docker-networks-for-container.yml.j2

@@ -0,0 +1,5 @@
+    networks:
+      - {{docker_compose_project_name}}_network  
+{% if enable_central_database %}
+      - central_{{ database_type }}_network
+{% endif %}

templates/docker-networks-for-role.yml.j2

@@ -0,0 +1,6 @@
+networks:
+{% if enable_central_database %}
+  central_{{ database_type }}_network:
+    external: true
+{% endif %}
+  {{docker_compose_project_name}}_network:

templates/docker-postgres-service.yml.j2

@@ -1,4 +1,4 @@
-  
+{% if not enable_central_database %}  
   database:
     image: postgres:{{database_version}}-alpine
     environment:
@@ -13,6 +13,9 @@
       timeout: 5s
       retries: 6
     volumes:
-      - type: volume
+      - type:   volume
         source: database
         target: /var/lib/postgresql/data
+    networks:
+      - {{docker_compose_project_name}}_network
+{% endif %}

templates/docker-redis-service.yml.j2

@@ -9,4 +9,6 @@
       test: ["CMD", "redis-cli", "ping"]
       interval: 1s
       timeout: 3s
-      retries: 30
+      retries: 30
+    networks:
+      - {{docker_compose_project_name}}_network