Odoo service in prod and test only depends on db if not using externa…

…l db

Fixes #150 (comment)

The DB service is always created in common and imported in devel and test, but not in prod. The dependency between services also reflects that.
By default, the devel and test environments will use the latest PG version.

common.yaml.jinja

@@ -32,9 +32,8 @@ services:
       traefik.port: "8069"
     {%- endif %}
 
-  {% if postgres_version -%}
   db:
-    image: ghcr.io/tecnativa/postgres-autoconf:{{ postgres_version }}-alpine
+    image: ghcr.io/tecnativa/postgres-autoconf:{{ postgres_version or "13" }}-alpine
     shm_size: 512mb
     environment:
       POSTGRES_DB: *dbname
@@ -43,7 +42,6 @@ services:
         work_mem = 512MB
     volumes:
       - db:/var/lib/postgresql/data:z
-  {%- endif %}
 
   smtpfake:
     image: mailhog/mailhog

devel.yaml.jinja

@@ -75,15 +75,13 @@ services:
       - --dev=reload,qweb,werkzeug,xml
       {%- endif %}
 
-  {% if postgres_version -%}
   db:
     extends:
       file: common.yaml
       service: db
     environment:
       POSTGRES_DB: *dbname
       POSTGRES_PASSWORD: odoopassword
-  {%- endif %}
 
   pgweb:
     image: sosedoff/pgweb

prod.yaml.jinja

@@ -20,7 +20,9 @@ services:
       SMTP_SERVER: smtplocal
       {%- endif %}
     depends_on:
+      {%- if postgres_version %}
       - db
+      {%- endif %}
       {%- if smtp_relay_host %}
       - smtp
       {%- endif %}
@@ -45,7 +47,8 @@ services:
       ) }}
       {%- endif %}
 
-  {% if postgres_version -%}
+  {%- if postgres_version %}
+
   db:
     extends:
       file: common.yaml

test.yaml.jinja

@@ -47,15 +47,13 @@ services:
       - --workers=2
       - --max-cron-threads=1
 
-  {% if postgres_version -%}
   db:
     extends:
       file: common.yaml
       service: db
     env_file:
       - .docker/db-creation.env
     restart: unless-stopped
-  {%- endif %}
 
   smtp:
     extends: