Adding a data volume to nextcloud

Instead of storing the nextcloud data as a docker volume,
store it on the local filesystem.

.env.sample

@@ -23,6 +23,11 @@ SECRET_ADMIN_PASSWORD_VERSION=v1
 
 EXTRA_VOLUME=/dev/null:/tmp/.dummy
 
+# Use a local bind mount for nextdata instead of a named volume.
+# The directory must exist on the host before deploying.
+# COMPOSE_FILE="$COMPOSE_FILE:compose.local-data.yml"
+# NEXTDATA_PATH=/path/on/host/nextdata
+
 PHP_MEMORY_LIMIT=1G
 PHP_UPLOAD_LIMIT=512M
 # fpm-tune, see: https://spot13.com/pmcalculator/

compose.local-data.yml

@@ -0,0 +1,7 @@
+volumes:
+  nextdata:
+    driver: local
+    driver_opts:
+      type: none
+      o: bind
+      device: ${NEXTDATA_PATH}