with command

.env.sample

@@ -1,3 +1,6 @@
+#SECRET_DB_PASSWORD_VERSION=v1
+#SECRET_SMTP_PASSWORD_VERSION=v1
+
 TYPE=ghost
 
 DOMAIN=ghost.example.com
@@ -13,7 +16,6 @@ LETS_ENCRYPT_ENV=production
 #MAIL_OPTIONS_PORT=587
 #MAIL_OPTIONS_SECURE=false
 #MAIL_OPTIONS_AUTH_USER=smtpuser@example.com
-#MAIL_OPTIONS_AUTH_PASS=XXXX
 
 ## Matrix-Synapse-Redirection
 # If you want to use Ghost on a TLD which you want to use as matrix server name as well

abra.sh

@@ -0,0 +1 @@
+export GHOST_ENTRYPOINT_VERSION=v1

compose.matrix.yml

@@ -1,4 +1,3 @@
-version: "3.8"
 services:
   app:
     deploy:

compose.yml

@@ -1,4 +1,3 @@
-version: "3.8"
 services:
   app:
     image: ghost:5-alpine
@@ -7,8 +6,8 @@ services:
       database__client: mysql
       database__connection__host: ${STACK_NAME}_db
       database__connection__user: root
-      database__connection__password: ghost
       database__connection__database: ghost
+      database__connection__password_FILE: /run/secrets/db_password
       url: https://$DOMAIN
       mail__transport: ${MAIL_TRANSPORT}
       mail__from: ${MAIL_FROM}
@@ -16,9 +15,18 @@ services:
       mail__options__port: ${MAIL_OPTIONS_PORT}
       mail__options__secure: ${MAIL_OPTIONS_SECURE}
       #mail__options__auth__user: ${MAIL_OPTIONS_AUTH_USER}
-      #mail__options__auth__pass: ${MAIL_OPTIONS_AUTH_PASS}
+      mail__options__auth__pass_FILE: /run/secrets/smtp_password
       # contrary to the default mentioned in the linked documentation, this image defaults to NODE_ENV=production (so development mode needs to be explicitly specified if desired)
       #NODE_ENV: development
+    secrets:
+      - db_password
+      - smtp_password
+    configs:
+      - source: ghost_entrypoint
+        target: /abra-entrypoint.sh
+        mode: 0555
+    command: node current/index.js
+    entrypoint: /abra-entrypoint.sh
     networks:
       - proxy
       - backend
@@ -52,7 +60,9 @@ services:
     networks:
       - backend
     environment:
-      MYSQL_ROOT_PASSWORD: ghost
+      MYSQL_ROOT_PASSWORD_FILE: /run/secrets/db_password
+    secrets:
+      - db_password
     volumes:
       - "mysql:/var/lib/mysql"
     deploy:
@@ -70,3 +80,16 @@ networks:
 volumes:
   mysql:
   ghost_content:
+
+secrets:
+  db_password:
+    name: ${STACK_NAME}_db_password_${SECRET_DB_PASSWORD_VERSION}
+    external: true
+  smtp_password:
+    external: true
+    name: ${STACK_NAME}_smtp_password_${SECRET_SMTP_PASSWORD_VERSION}
+
+configs:
+  ghost_entrypoint:
+    name: ${STACK_NAME}_ghost_entrypoint_${GHOST_ENTRYPOINT_VERSION}
+    file: entrypoint.sh

entrypoint.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+set -e
+
+file_env() {
+   local var="$1"
+   local fileVar="${var}_FILE"
+   local def="${2:-}"
+
+   if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
+      echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
+      exit 1
+   fi
+
+   local val="$def"
+
+   if [ "${!var:-}" ]; then
+      val="${!var}"
+   elif [ "${!fileVar:-}" ]; then
+      val="$(< "${!fileVar}")"
+   fi
+
+   export "$var"="$val"
+   unset "$fileVar"
+}
+
+
+file_env "database__connection__password"
+file_env "mail__options__auth__pass"
+
+# upstream entrypoint https://github.com/docker-library/ghost/blob/master/5/alpine/Dockerfile
+/usr/local/bin/docker-entrypoint.sh "$@"