Add 'wipe-mailbox' action to the queue system

roles/queue/files/wipe-mailbox.sh

+#!/bin/bash
+
+confirm=0
+mailbox=
+while [ $# -gt 0 ]; do
+    case "$1" in
+        --yes-i-am-sure)
+            confirm=1
+            ;;
+        -*)
+            echo "Unkown option $1" >&2
+            exit 2
+            ;;
+        *)
+            # First argument is the mailbox name.
+            if [ -n "${mailbox}" ]; then
+                echo "Too many arguments ">&2
+                exit 2
+            fi
+            mailbox="$1"
+            ;;
+    esac
+    shift
+done
+
+if [ -z "${mailbox}" ]; then
+    echo "Usage: $0 <mailbox>" >&2
+    exit 2
+fi
+
+if [ $confirm -ne 1 ]; then
+    echo "You did not pass the confirmation option --yes-i-am-sure!" >&2
+    exit 1
+fi
+
+set -euo pipefail
+
+# Get the list of mailboxes in an array.
+readarray -t mailbox_list < <(doveadm mailbox list -u ${mailbox} 2>&1)
+
+# Expunge each one.
+for m in "${mailbox_list[@]}"; do
+    doveadm mailbox expunge -u "${mailbox}" mailbox "${m}" all
+done
+
+doveadm purge -u "${mailbox}"
+
+exit 0