service: Make postgres version configurable

roles/service/defaults/main.yml

@@ -11,6 +11,7 @@ docker_proxy_target_protocol: http
 docker_additional_env: {}
 docker_additional_services: []
 docker_database: none
+docker_postgres_tag: 14-alpine
 docker_mounts: []
 docker_network_mode: ""
 docker_networks: []

roles/service/meta/argument_specs.yml

@@ -54,6 +54,11 @@ argument_specs:
           set a password for the mariadb root user
         type: dict
         required: false
+      docker_postgres_tag:
+        description: 'Postgresql version to use. Can be debian (n) or alpine-based (n-alpine), where n can be major version like 14 or minor like 14.13.'
+        type: str
+        required: false
+        default: 14-alpine
       docker_mariadb_config:
         description: |
           A dict specifying config for mariadb. For example

roles/service/tasks/database.yml

@@ -2,7 +2,7 @@
 
 - name: Set postgres container vars
   ansible.builtin.set_fact:
-    db_container_image: 'postgres:14-alpine'
+    db_container_image: 'postgres:{{ docker_postgres_tag }}'
     db_container_env:
       POSTGRES_USER: "{{ docker_service_underscore_name }}"
       POSTGRES_PASSWORD: "{{ database_passwords[docker_service_name] }}"