lab: the lab as a module, running beds when the mesh asks

Five tools on the machine the lab runs on: check, run beds against
branches on the forge, a run's status, its log, and stop. A run checks
out every repository the lab builds, side by side, and runs the suite;
one at a time, answered at once with an id (novox/hq ADR 0172).

modules/lab/module.json

@@ -0,0 +1,81 @@
+{
+  "module": "lab",
+  "version": "1",
+  "capabilities": [
+    "container-runtime"
+  ],
+  "own-secrets": {
+    "broker": "${dir:mesh-state}/broker"
+  },
+  "resources": [
+    {
+      "id": "mesh-state",
+      "type": "directory",
+      "mode": "0700",
+      "place": "mesh"
+    },
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": "."
+    },
+    {
+      "id": "work",
+      "type": "directory",
+      "path": "/var/lib/mesh-lab-runs",
+      "mode": "0700"
+    },
+    {
+      "id": "runtime-env",
+      "type": "file",
+      "path": "${dir:state}/lab.env",
+      "mode": "0600",
+      "content": "MESH_LAB_FORGE=${setting:forge}\n"
+    },
+    {
+      "id": "runtime",
+      "type": "container",
+      "name": "mesh-lab",
+      "network": "host",
+      "env-file": [
+        "${dir:state}/lab.env"
+      ],
+      "volumes": [
+        "${dir:mesh-state}/broker:/run/secrets/broker:ro",
+        "${dir:work}:${dir:work}",
+        "/var/run/docker.sock:/var/run/docker.sock",
+        "/var/lib/incus/unix.socket:/var/lib/incus/unix.socket"
+      ],
+      "env": {
+        "MESH_BROKER_FILE": "/run/secrets/broker",
+        "MESH_LAB_WORK": "${dir:work}"
+      },
+      "restart-on": [
+        "runtime-env"
+      ],
+      "artifact": "runtime"
+    }
+  ],
+  "build": {
+    "on": [
+      {
+        "arg": "BUILD_BASE",
+        "module": "mesh-tools",
+        "artifact": "build"
+      },
+      {
+        "arg": "RUNTIME_BASE",
+        "module": "mesh-tools",
+        "artifact": "runtime"
+      }
+    ],
+    "artifacts": [
+      {
+        "name": "runtime",
+        "kind": "image",
+        "from": "Dockerfile"
+      }
+    ]
+  }
+}