baikal playbook: move mail config into a variable

sabre-dav/templates/container/baikal.container.j2

@@ -7,16 +7,7 @@ AutoUpdate=registry
 PublishPort={{ baikal.port }}:80/tcp
 Volume={{ baikal.base_directory }}/{{ baikal.data_directory }}:/var/www/baikal/Specific:Z
 Volume={{ baikal.base_directory }}/{{ baikal.config_directory }}:/var/www/baikal/config:Z
-Environment="MSMTPRC=defaults\n\
+Environment="MSMTPRC={{ baikal.mail }}
-auth           on\n\
-tls            on\n\
-tls_trust_file /etc/ssl/certs/ca-certificates.crt\n\
-account        default\n\
-host           host\n\
-port           587\n\
-from           baikal@example.com\n\
-user           user\n\
-password       pass\n\
 "
 
 [Service]

sabre-dav/variables.yaml

@@ -5,3 +5,14 @@ baikal:
   base_directory: "/baikal"
   data_directory: "data"
   config_directory: "config"
+  mail: |
+    defaults\n\
+    auth           on\n\
+    tls            on\n\
+    tls_trust_file /etc/ssl/certs/ca-certificates.crt\n\
+    account        default\n\
+    host           host\n\
+    port           587\n\
+    from           baikal@example.com\n\
+    user           user\n\
+    password       pass\n\