Add dummy secrets json

iac/dummy-secrets.json

@@ -0,0 +1,10 @@
+{   "nextcloud": {
+        "password": "password",
+        "mariadb-root-password": "root-password",
+        "mariadb-password": "password",
+        "host": "nextcloud.example.com"
+    },
+    "dns": {
+        "service-sub-domain": "cloudflare-domain-zoneid"
+    }
+ }