Add option to remove mailbox data

Fixes #720

src/scripts/rmmailbox.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+set -eu -o pipefail
+
+if [[ ${EUID} -ne 0 ]]; then
+    echo "This script should be run as root." > /dev/stderr
+    exit 1
+fi
+
+if [[ $# -eq 0 ]]; then
+    echo "No arguments supplied"
+    exit 1
+fi
+
+if [[ "$1" == "--check" ]]; then
+    echo "OK"
+    exit 0
+fi
+
+mailbox="$1"
+
+if [[ "${BOX_ENV}" == "cloudron" ]]; then
+    readonly mailbox_dir="${HOME}/boxdata/mail/vmail/$1"
+else
+    readonly mailbox_dir="${HOME}/.cloudron_test/boxdata/mail/vmail/$1"
+fi
+
+rm -rf "${mailbox_dir}"
+