remove secret db_password if not using postgres

.env.sample

@@ -16,7 +16,6 @@ GRIST_HIDE_UI_ELEMENTS=billing,sendToDrive
 GRIST_DEFAULT_EMAIL=grist@example.com
 
 SECRET_GRIST_SESSION_SECRET_VERSION=v1
-SECRET_DB_PASSWORD_VERSION=v1
 
 COMPOSE_FILE="compose.yml"
 
@@ -36,3 +35,4 @@ COMPOSE_FILE="compose.yml"
 
 # Postgres DB instead of SQLite (beware performance issues)
 #COMPOSE_FILE="$COMPOSE_FILE:compose.postgres.yml"
+#SECRET_DB_PASSWORD_VERSION=v1

compose.yml

@@ -48,9 +48,6 @@ services:
       - 'redis_data:/data'
 
 secrets:
-  db_password:
-    external: true
-    name: ${STACK_NAME}_db_password_${SECRET_DB_PASSWORD_VERSION}
   session_secret:
     external: true
     name: ${STACK_NAME}_session_secret_${SECRET_GRIST_SESSION_SECRET_VERSION}