Add the teller module that waits for the gate's asks and writes nothing in release 3c (issue 1240)

modules/mesh-delivery-teller/module.json

@@ -0,0 +1,63 @@
+{
+  "module": "mesh-delivery-teller",
+  "version": "1",
+  "slug": "teller",
+  "state": [
+    { "name": "answers", "history": 5 }
+  ],
+  "reads": [
+    "mesh-delivery-gate.asks"
+  ],
+  "uses": [
+    "operator-channel"
+  ],
+  "own-secrets": {
+    "broker": "${dir:state}/broker"
+  },
+  "secrets-owner": "mesh-delivery-teller",
+  "resources": [
+    {
+      "id": "account",
+      "type": "user",
+      "name": "mesh-delivery-teller",
+      "shell": "/usr/bin/nologin",
+      "home": "/var/lib/mesh-delivery-teller"
+    },
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "owner": "mesh-delivery-teller",
+      "place": ".",
+      "unknown": "program"
+    },
+    {
+      "id": "teller",
+      "type": "process",
+      "name": "mesh-delivery-teller",
+      "artifact": "program",
+      "run": [
+        "./mesh-delivery-teller"
+      ],
+      "env": {
+        "MESH_BROKER_FILE": "${dir:state}/broker"
+      },
+      "user": "mesh-delivery-teller",
+      "health": {
+        "kind": "unit"
+      }
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "program",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/mesh-delivery-teller",
+        "binary": "mesh-delivery-teller"
+      }
+    ]
+  }
+}