WIP Refactor code base

Add a library file containing common logic to be sourced by individual backup scripts

common-backup.sh

@@ -21,6 +21,8 @@ enable_maintenance_mode() {
   local c="$1"
   local cmd="$2"
   log "Enabling maintenance mode for $c..."
+  # we explcitly do not want to stringify here
+  # shellcheck disable=SC2086
   docker exec -u www-data "$c" $cmd || { log "Error enabling maintenance mode"; exit 1; }
 }
 
@@ -28,6 +30,8 @@ disable_maintenance_mode() {
   local c="$1"
   local cmd="$2"
   log "Disabling maintenance mode for $c..."
+  # we explcitly do not want to stringify here
+  # shellcheck disable=SC2086
   docker exec -u www-data "$c" $cmd || { log "Error disabling maintenance mode"; exit 1; }
 }