[DCK] Make sure we always use the local SMTP server

Fixes #18 by avoiding the usage of the `smtp` hostname in environments where shared networks are used, since that is possibly repeated.

common.yaml

@@ -62,6 +62,7 @@ services:
             PGDATABASE: prod
             PGPASSWORD: "$DB_PASSWORD"
             PGUSER: "$DB_USER"
+            SMTP_HOST: smtplocal
         volumes:
             - backup_cache:/root:z
             - filestore:/mnt/backup/src/odoo:z

prod.yaml

@@ -8,6 +8,7 @@ services:
         environment:
             INITIAL_LANG: "$INITIAL_LANG"
             PGDATABASE: &dbname prod
+            SMTP_SERVER: smtplocal
         depends_on:
             - db
             - smtp
@@ -46,6 +47,10 @@ services:
         extends:
             file: common.yaml
             service: smtpreal
+        networks:
+            default:
+                aliases:
+                    - smtplocal
         restart: unless-stopped
 
     backup:

test.yaml

@@ -9,6 +9,7 @@ services:
             # You may want demo data for testing
             WITHOUT_DEMO: "false"
             SMTP_PORT: "1025"
+            SMTP_SERVER: smtplocal
         restart: unless-stopped
         depends_on:
             - db
@@ -53,6 +54,8 @@ services:
         restart: unless-stopped
         networks:
             default:
+                aliases:
+                    - smtplocal
             inverseproxy_shared:
         labels:
             traefik.docker.network: "inverseproxy_shared"