Support SMTP relay configuration

Hopefully this doesn't bork existing relay configs

.env.sample

@@ -32,4 +32,8 @@ SECRET_DB_PASSWORD_VERSION=v1
 # SMTP
 #COMPOSE_FILE="compose.yml:compose.mailrelay.yml"
 #SMTP_HOST="postfix_relay_app"
+#SMTP_PORT=587
+#SMTP_AUTH=on
+#SMTP_TLS=on
 #MAIL_FROM="wordpress@example.com"
+#SECRET_SMTP_PASSWORD_VERSION=v1

abra.sh

@@ -1,7 +1,7 @@
 export PHP_UPLOADS_CONF_VERSION=v3
 export ENTRYPOINT_CONF_VERSION=v2
 export ENTRYPOINT_MAILRELAY_CONF_VERSION=v1
-export MSMTP_CONF_VERSION=v1
+export MSMTP_CONF_VERSION=v2
 
 sub_wp() {
   CONTAINER=$(docker container ls -f "Name=${STACK_NAME}_app" --format '{{ .ID }}')

compose.mailrelay.yml

@@ -4,8 +4,13 @@ version: "3.8"
 services:
   app:
     entrypoint: /docker-entrypoint.mailrelay.sh
+    secrets:
+      - smtp_password
     environment:
       - SMTP_HOST=${SMTP_HOST}
+      - SMTP_PORT=${SMTP_PORT}
+      - SMTP_AUTH=${SMTP_AUTH}
+      - SMTP_TLS=${SMTP_TLS}
       - MAIL_FROM=${MAIL_FROM}
     configs:
       - source: mstmp_conf
@@ -23,3 +28,8 @@ configs:
     name: ${STACK_NAME}_entrypoint_mailrelay_${ENTRYPOINT_MAILRELAY_CONF_VERSION}
     file: entrypoint.mailrelay.sh.tmpl
     template_driver: golang
+
+secrets:
+  smtp_password:
+    name: ${STACK_NAME}_smtp_password_${SECRET_SMTP_PASSWORD_VERSION}
+    external: true

msmtp.conf.tmpl

@@ -1,3 +1,14 @@
 account default
 host {{ env "SMTP_HOST" }}
 from {{ env "MAIL_FROM" }}
+port {{ env "SMTP_PORT" }}
+
+{{ if eq (env "SMTP_AUTH") "on" }}
+auth {{ env "SMTP_AUTH" }}
+passwordeval "cat /run/secrets/smtp_password"
+{{ end }}
+
+{{ if eq (env "SMTP_TLS") "on" }}
+tls {{ env "SMTP_TLS" }}
+tls_trust_file /etc/ssl/certs/ca-certificates.crt
+{{ end }}