ADR 0056: selectable ACME issuer, step-ca init from operator root, route labels

Piece A + B of ADR 0056, completing the internal-CA work in ff01ada.

Selectable issuer. acme-ca is now a role two providers can satisfy: step-ca
(internal CA) or the new public-acme (a fact-only module, no container/listen)
that serves Let's Encrypt production. A mesh assigns one or the other to satisfy
route-proxy's `requires: acme-ca`.

One directory shape for both. A provider serves the ACME directory's parts the
way the mesh already models any reachable service -- an address (`at`), a `port`
and a `path` -- and route-proxy composes `https://<at>:<port><path>`. step-ca
lets the mesh fill `at` (its node) and `port` (its single listen) and serves only
`path`; public-acme, not being a mesh service, serves all three (overriding `at`
with the public host). Same composition either way.

Empty root means the system trust store. Both providers serve `root`: step-ca
the operator root PEM (settled per mesh), public-acme an empty string. route-proxy
writes it to the CA bundle file unconditionally; the binary now reads an empty
bundle as "the root is already trusted by the OS" and falls back to system roots
(examples/route-proxy/main.go, committed on the mesh-control ADR-0056 branch).

step-ca inits from the operator's root. The operator's root cert, root key and
root-key password are mounted at the smallstep entrypoint's default init paths
(/run/secrets/root_ca.crt, root_ca_key, root_ca_key_password) with the matching
DOCKER_STEPCA_INIT_*_FILE vars, so `step ca init` adopts the operator's root
instead of self-generating one -- the CA that signs is the CA route-proxy trusts.

Route names are labels, not FQDNs. Every routed module now contributes a `label`
(the leftmost subdomain) instead of a full public hostname; the node's public
domain composes the name. Apex (novox.be) is left as a full name -- composeName
has no empty-label/apex convention yet (mesh-control follow-up).

Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF

modules/baserow/module.json

@@ -14,7 +14,7 @@
       "name": "baserow"
     },
     "route": {
-      "name": "baserow.zurag.be",
+      "label": "baserow",
       "port": 80
     }
   },

modules/bazarr/module.json

@@ -109,7 +109,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "subs.zurag.be",
+      "label": "subs",
       "port": 6767
     }
   },

modules/bookshelf/module.json

@@ -85,7 +85,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "books.zurag.be",
+      "label": "books",
       "port": 8787
     }
   },

modules/de-spiegel/module.json

@@ -10,7 +10,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "de-spiegel.novox.be",
+      "label": "de-spiegel",
       "port": 35621
     }
   },

modules/gitea/module.json

@@ -10,7 +10,7 @@
       "name": "gitea"
     },
     "route": {
-      "name": "git.novox.be",
+      "label": "git",
       "port": 3000
     }
   },

modules/grafana/module.json

@@ -94,7 +94,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "grafana.zurag.be",
+      "label": "grafana",
       "port": 3000
     }
   },

modules/hello-web/module.json

@@ -10,7 +10,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "hello.example",
+      "label": "hello",
       "port": 8080
     }
   },

modules/home-assistant/module.json

@@ -83,7 +83,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "home-assistant.zurag.be",
+      "label": "home-assistant",
       "port": 8123
     }
   },

modules/invoicing/module.json

@@ -17,7 +17,7 @@
       "bucket": "invoicing"
     },
     "route": {
-      "name": "invoicing.novox.be",
+      "label": "invoicing",
       "port": 80
     }
   },

modules/jackett/module.json

@@ -81,7 +81,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "indexers.zurag.be",
+      "label": "indexers",
       "port": 9117
     }
   },

modules/keycloak/module.json

@@ -10,7 +10,7 @@
       "name": "keycloak"
     },
     "route": {
-      "name": "keycloak.novox.be",
+      "label": "keycloak",
       "port": 8080
     }
   },

modules/lidarr/module.json

@@ -85,7 +85,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "lidarr.zurag.be",
+      "label": "lidarr",
       "port": 8686
     }
   },

modules/mailu/module.json

@@ -13,7 +13,7 @@
       "name": "mailu"
     },
     "route": {
-      "name": "mail.novox.be",
+      "label": "mail",
       "port": 7080
     }
   },

modules/n8n/module.json

@@ -14,7 +14,7 @@
       "name": "n8n"
     },
     "route": {
-      "name": "n8n.zurag.be",
+      "label": "n8n",
       "port": 5682
     }
   },

modules/nextcloud/module.json

@@ -14,7 +14,7 @@
       "bucket": "nextcloud"
     },
     "route": {
-      "name": "nextcloud.novox.be",
+      "label": "nextcloud",
       "port": 80
     }
   },

modules/nodered/module.json

@@ -80,7 +80,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "nodered.zurag.be",
+      "label": "nodered",
       "port": 1880
     }
   },

modules/ombi/module.json

@@ -88,7 +88,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "ombi.zurag.be",
+      "label": "ombi",
       "port": 3579
     }
   },

modules/only-office/module.json

@@ -10,7 +10,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "office.novox.be",
+      "label": "office",
       "port": 9070
     }
   },

modules/photos-eef/module.json

@@ -10,7 +10,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "eef.novox.be",
+      "label": "eef",
       "port": 4012
     }
   },

modules/photos-filip/module.json

@@ -10,7 +10,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "filip.novox.be",
+      "label": "filip",
       "port": 4013
     }
   },

modules/photos/module.json

@@ -17,7 +17,7 @@
       "name": "photos"
     },
     "route": {
-      "name": "photos.novox.be",
+      "label": "photos",
       "port": 4001
     }
   },

modules/public-acme/module.json

@@ -0,0 +1,18 @@
+{
+  "module": "public-acme",
+  "version": "1",
+  "provides": [
+    {
+      "name": "acme-ca",
+      "scope": "mesh"
+    }
+  ],
+  "serves": {
+    "acme-ca": {
+      "at": "acme-v02.api.letsencrypt.org",
+      "port": 443,
+      "path": "/directory",
+      "root": ""
+    }
+  }
+}

modules/radarr/module.json

@@ -85,7 +85,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "movies.zurag.be",
+      "label": "movies",
       "port": 7878
     }
   },

modules/registry/module.json

@@ -60,7 +60,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "registry-api.novox.be",
+      "label": "registry-api",
       "port": 5000
     }
   },

modules/route-proxy/module.json

@@ -73,7 +73,7 @@
       "type": "file",
       "path": "/var/lib/route-proxy/acme.env",
       "mode": "0600",
-      "content": "ACME_DIRECTORY=https://${bound:acme-ca:at}:${bound:acme-ca:port}/acme/acme/directory\n"
+      "content": "ACME_DIRECTORY=https://${bound:acme-ca:at}:${bound:acme-ca:port}${bound:acme-ca:path}\n"
     },
     {
       "id": "server",

modules/searxng/module.json

@@ -105,7 +105,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "searxng.zurag.be",
+      "label": "searxng",
       "port": 8080
     }
   },

modules/sonarr/module.json

@@ -90,7 +90,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "series.zurag.be",
+      "label": "series",
       "port": 8989
     }
   },

modules/step-ca/module.json

@@ -11,7 +11,10 @@
     }
   ],
   "serves": {
-    "acme-ca": {}
+    "acme-ca": {
+      "path": "/acme/acme/directory",
+      "root": ""
+    }
   },
   "listens": [
     {
@@ -23,7 +26,9 @@
   ],
   "own-secrets": {
     "password": "/var/lib/mesh/step-ca/password",
-    "root-key": "/var/lib/mesh/step-ca/root-key"
+    "root-cert": "/var/lib/mesh/step-ca/root-cert",
+    "root-key": "/var/lib/mesh/step-ca/root-key",
+    "root-key-password": "/var/lib/mesh/step-ca/root-key-password"
   },
   "resources": [
     {
@@ -67,11 +72,16 @@
         "DOCKER_STEPCA_INIT_NAME": "Mesh Internal CA",
         "DOCKER_STEPCA_INIT_DNS_NAMES": "localhost,127.0.0.1",
         "DOCKER_STEPCA_INIT_ACME": "true",
-        "DOCKER_STEPCA_INIT_REMOTE_MANAGEMENT": "false"
+        "DOCKER_STEPCA_INIT_REMOTE_MANAGEMENT": "false",
+        "DOCKER_STEPCA_INIT_ROOT_FILE": "/run/secrets/root_ca.crt",
+        "DOCKER_STEPCA_INIT_KEY_FILE": "/run/secrets/root_ca_key",
+        "DOCKER_STEPCA_INIT_KEY_PASSWORD_FILE": "/run/secrets/root_ca_key_password"
       },
       "volumes": [
         "/var/lib/step-ca:/home/step",
-        "/var/lib/mesh/step-ca/root-key:/run/secrets/root-key:ro",
+        "/var/lib/mesh/step-ca/root-cert:/run/secrets/root_ca.crt:ro",
+        "/var/lib/mesh/step-ca/root-key:/run/secrets/root_ca_key:ro",
+        "/var/lib/mesh/step-ca/root-key-password:/run/secrets/root_ca_key_password:ro",
         "/var/lib/mesh/step-ca/config.json:/run/config/config.json:ro"
       ]
     }

modules/tautulli/module.json

@@ -84,7 +84,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "tautulli.zurag.be",
+      "label": "tautulli",
       "port": 8181
     }
   },

modules/umami/module.json

@@ -13,7 +13,7 @@
       "name": "umami"
     },
     "route": {
-      "name": "umami.novox.be",
+      "label": "umami",
       "port": 3000
     }
   },

modules/verdaccio/module.json

@@ -92,7 +92,7 @@
   ],
   "contributes": {
     "route": {
-      "name": "npm.novox.be",
+      "label": "npm",
       "port": 4873
     }
   },