mailu: its handlers, tools and provisioner run in the node's runtime (hq ADR 0198)

The mesh-mailu container goes with its Dockerfile, the mesh-tools build bases and its bus credential; automx keeps its own image. The code reached the admin API by its name on the mailu network, which a process on the machine cannot, so the admin container publishes 8080 to this machine only and the bundle reaches it on loopback at that port. Mail is still read through docker exec into mailu-imap, so the runtime's account needs the docker socket as nextcloud's does.

modules/mailu/Dockerfile

@@ -1,30 +0,0 @@
-# mailu's runtime: the tool runtime, carrying this module's compiled code.
-#
-# **Built from this module's own directory and nothing else.** The sdk and the tool runtime are in
-# the base images, published like any other artifact — which is what makes this buildable by the
-# mesh from a repository and a path (novox/hq ADR 0069) rather than only on a workstation that
-# happens to have the siblings.
-#
-# Two bases, named rather than pinned (novox/hq issue 044): the image this is COMPILED in and the
-# image it RUNS in — the second must not carry a compiler. Declared in module.json's `build.on`.
-ARG BUILD_BASE
-ARG RUNTIME_BASE
-
-FROM ${BUILD_BASE} AS build
-# Compiled under /app/modules so `@novox/mesh-sdk` resolves upward into the base's own
-# node_modules — the module is compiled against exactly the sdk it will run against. The compiler
-# is invoked by its real path: node_modules/.bin entries are launcher symlinks the base image
-# resolved away.
-WORKDIR /app/modules/mailu
-COPY . .
-RUN node /app/node_modules/typescript/bin/tsc client.ts index.ts tools/index.ts provisioner/index.ts \
-      --module NodeNext --moduleResolution NodeNext --target ES2022 --outDir dist
-
-FROM ${RUNTIME_BASE}
-COPY --from=build /app/modules/mailu/dist /app/modules/mailu/dist
-# Every serve-time entrypoint, loaded by the runtime in serve mode: tools and events serve, and a
-# provider's provisioner runs its reconcile loop in the same process, with the broker connected —
-# the convention novox/hq issues 060/061 settled. A container that instead ran only its
-# provisioner (`run`) served no tools and emitted no events; a container that named no command
-# ran no provisioner at all.
-ENV MESH_TOOL_MODULES=/app/modules/mailu/dist/index.js,/app/modules/mailu/dist/tools/index.js,/app/modules/mailu/dist/provisioner/index.js

modules/mailu/module.json

@@ -135,11 +135,15 @@
       "protocol": "tcp",
       "from": "mesh",
       "why": "automx: mail client autoconfiguration; the autoconfig, autodiscover and automx names are route grants reaching it here"
+    },
+    {
+      "name": "admin-api",
+      "port": 8080,
+      "protocol": "tcp",
+      "from": "machine",
+      "why": "the admin API, which this module's own code reaches on loopback from the node's runtime now that it runs outside the mailu network"
     }
   ],
-  "own-secrets": {
-    "broker": "${dir:mesh-state}/broker"
-  },
   "resources": [
     {
       "id": "mesh-state",
@@ -305,6 +309,9 @@
       "name": "mailu-admin",
       "image": "ghcr.io/mailu/admin@sha256:6dbfdadc4a9590dcb7652357b505200115b689b74008653bbf369e4599a3be5a",
       "network": "mailu",
+      "ports": [
+        "8080"
+      ],
       "env-file": [
         "${dir:state}/mailu.env",
         "${dir:state}/secret.env",
@@ -473,31 +480,6 @@
       "content": "{}\n",
       "merge": "json"
     },
-    {
-      "id": "runtime",
-      "type": "container",
-      "name": "mesh-mailu",
-      "network": "mailu",
-      "volumes": [
-        "${dir:mesh-state}/broker:/run/secrets/broker:ro",
-        "${dir:state}/api-token.secret:/run/secrets/api-token:ro",
-        "${dir:grants}:${dir:grants}:ro",
-        "${dir:mesh-state}/config.json:/run/config/config.json:ro",
-        "/var/run/docker.sock:/var/run/docker.sock"
-      ],
-      "env": {
-        "MESH_BROKER_FILE": "/run/secrets/broker",
-        "MESH_MAILU_URL": "http://mailu-admin:8080/api/v1",
-        "MESH_MAILU_API_KEY_FILE": "/run/secrets/api-token",
-        "MESH_MAILU_IMAP_CONTAINER": "mailu-imap",
-        "MESH_MAILU_CONFIG_FILE": "/run/config/config.json",
-        "MESH_RECEIVES": "${dir:grants}/mesh.json"
-      },
-      "restart-on": [
-        "runtime-config"
-      ],
-      "artifact": "runtime"
-    },
     {
       "id": "automx",
       "type": "container",
@@ -517,16 +499,6 @@
   ],
   "build": {
     "on": [
-      {
-        "arg": "BUILD_BASE",
-        "module": "mesh-tools",
-        "artifact": "build"
-      },
-      {
-        "arg": "RUNTIME_BASE",
-        "module": "mesh-tools",
-        "artifact": "runtime"
-      },
       {
         "arg": "PYTHON_BASE",
         "image": "python@sha256:25f3cfeaceca14921366af4d1240b56457ef46273bdb508c7b0e8f469f6fd228"
@@ -534,9 +506,26 @@
     ],
     "artifacts": [
       {
-        "name": "runtime",
-        "kind": "image",
-        "from": "Dockerfile"
+        "name": "code",
+        "kind": "bundle",
+        "language": "typescript",
+        "entrypoints": [
+          "index.js",
+          "tools/index.js",
+          "provisioner/index.js"
+        ],
+        "loads": [
+          "index.js",
+          "tools/index.js",
+          "provisioner/index.js"
+        ],
+        "env": {
+          "MESH_MAILU_URL": "http://127.0.0.1:${port:8080}/api/v1",
+          "MESH_MAILU_API_KEY_FILE": "${dir:state}/api-token.secret",
+          "MESH_MAILU_IMAP_CONTAINER": "mailu-imap",
+          "MESH_MAILU_CONFIG_FILE": "${dir:mesh-state}/config.json",
+          "MESH_RECEIVES": "${dir:grants}/mesh.json"
+        }
       },
       {
         "name": "automx",