Added env vars to override all storage dirs

.env.example

@@ -19,6 +19,18 @@
 # Default if not set: TRUE
 #SPOOLMAN_AUTOMATIC_BACKUP=TRUE
 
+# Data directory, where the SQLite database is stored
+# Default if not set: /home/<user>/.local/share/spoolman
+#SPOOLMAN_DIR_DATA=/home/pi/spoolman_data
+
+# Backup directory, where the SQLite database backups are stored
+# Default if not set: /home/<user>/.local/share/spoolman/backups
+#SPOOLMAN_DIR_BACKUPS=/home/pi/spoolman_data/backups
+
+# Log directory
+# Default if not set: /home/<user>/.local/share/spoolman
+#SPOOLMAN_DIR_LOGS=/home/pi/spoolman_data
+
 # Host and port to listen on
 SPOOLMAN_HOST=0.0.0.0
 SPOOLMAN_PORT=7912