Add optional compose file for `lib` persistence

.env.sample

@@ -5,8 +5,13 @@ DOMAIN=federatedwiki.example.com
 #EXTRA_DOMAINS=', `www.federatedwiki.example.com`'
 LETS_ENCRYPT_ENV=production
 
+COMPOSE_FILE="compose.yml"
+
 # Predefined "owner" security
-#COMPOSE_FILE="compose.yml:compose.owner.yml"
+#COMPOSE_FILE="$COMPOSE_FILE:compose.owner.yml"
+
+# Persistent "lib" volume
+#COMPOSE_FILE="$COMPOSE_FILE:compose.lib.yml"
 
 COOKIE_SECRET="asflkjqpweoriuwpeogdjgbpdofigh"
 AUTHOR="Baja Colorado"

compose.lib.yml

@@ -0,0 +1,10 @@
+---
+version: "3.8"
+
+services:
+  app:
+    volumes:
+      - "fedwiki_lib:/home/node/lib"
+
+volumes:
+  fedwiki_lib: