add smtp support

.env.sample

@@ -12,3 +12,12 @@ LOG_FILE=/data/vaultwarden.log
 LOG_LEVEL=warn
 
 SECRET_ADMIN_TOKEN_VERSION=v1 # length=48
+
+# SMTP settings
+#COMPOSE_FILE="$COMPOSE_FILE:compose.smtp.yml"
+#SECRET_SMTP_PASSWORD_VERSION=v1
+#SMTP_FROM=
+#SMTP_USERNAME=
+#SMTP_HOST=
+#SMTP_PORT=587
+#SMTP_SECURITY=starttls

compose.smtp.yml

@@ -0,0 +1,19 @@
+---
+version: "3.8"
+  
+services:
+  app:
+    environment:
+      - SMTP_FROM
+      - SMTP_HOST
+      - SMTP_PORT
+      - SMTP_SECURITY
+      - SMTP_USERNAME
+      - SMTP_PASSWORD_FILE=/run/secrets/smtp_password
+    secrets:
+      - smtp_password
+
+secrets:
+  smtp_password:
+    external: true
+    name: ${STACK_NAME}_smtp_password_${SECRET_SMTP_PASSWORD_VERSION}