add letsencrypt bundle

bundles/letsencrypt/files/domains.txt

@@ -0,0 +1,5 @@
+${node.hostname}
+
+% for domain, aliases in node.metadata.get('letsencrypt', {}).get('domains', {}).items():
+${domain} ${' '.join(aliases)}
+% endfor

bundles/letsencrypt/items.py

@@ -0,0 +1,24 @@
+assert node.has_bundle('nginx'), 'letsencrypt needs nginx'
+
+pkg_apt = {
+    'dehydrated': {},
+}
+
+actions = {
+    'letsencrypt_update_certificates': {
+        'command': 'dehydrated --cron --accept-terms --ocsp --challenge http-01',
+        'triggered': True,
+        'needs': {
+            'pkg_apt:dehydrated',
+        },
+    },
+}
+
+files = {
+    '/etc/dehydrated/domains.txt': {
+        'content_type': 'mako',
+        'triggers': {
+            'action:letsencrypt_update_certificates',
+        },
+    },
+}