add restic role

roles/restic/templates/env.sh.j2

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+export RESTIC_REPOSITORY="{{ item.repo }}"
+{% for k, v in item.environment.items() %}
+export {{ k | upper }}="{{ v }}"
+{% endfor %}

roles/restic/templates/exclude.txt.j2

@@ -0,0 +1,3 @@
+{% for exclude in item.exclude %}
+{{ exclude }}
+{% endfor %}