mutt: Add mutt-folder helper script

mutt/files/mutt-folder.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+set -eu
+
+if [ $# -ne 1 ]; then
+    echo "Usage: $(basename "$0") <folder>" >&2
+    exit 1
+fi
+mutt -R -f "$1"

mutt/tasks/main.yml

@@ -11,3 +11,11 @@
     mode: 0644
     owner: root
     group: "{{ ansible_wheel }}"
+
+- name: install mutt-folder helper script
+  copy:
+    dest: /usr/local/bin/mutt-folder
+    src: mutt-folder.sh
+    mode: 0755
+    owner: root
+    group: "{{ ansible_wheel }}"