Share the postfix showq socket with exporter

pica-mail/docker-compose.yml

@@ -9,6 +9,8 @@ networks:
 volumes:
   mail-mda-maildir:
     name: mail-mda-maildir
+  mail-mta-spool:
+    name: mail-mta-spool
 
 services:
   mail-mda:
@@ -45,6 +47,8 @@ services:
     volumes:
       - /var/log/mail.log:/var/log/mail.log
       - /var/log/opendmarc.log:/var/log/opendmarc.log
+      # For sharing with exporter
+      - mail-mta-spool:/var/spool/postfix
       #doit contenir selecteur.domaine.rsa
       - /DATA/docker/mail/opendkim/:/etc/dkimkeys/
       - /DATA/docker/certs/mail.picasoft.net/:/certs-ssl/:ro
@@ -97,6 +101,7 @@ services:
       # By default, postfix-exporter reads from /var/log/mail.log, so no need to configure
       - /var/log/mail.log:/var/log/mail.log
       - /etc/localtime:/etc/localtime:ro
+      - mail-mta-spool:/var/spool/postfix:ro
     command:
       # Listen on all interfaces
       - "--web.listen-address=0.0.0.0:9154"