Capture mesh-catalog at feat/r4g (2246ccc4) with the templates its manifests name and its predefined.json, and lay the copy out as a repository's root

The catalogue's manifests moved their content into template files and fall back to predefined keys, so a copy of
module.json alone no longer passes the catalogue's own check; the bus's Dockerfile is gone from the catalogue.

testdata/beside/mesh-catalog/modules/icecast/module.json.captured

@@ -47,31 +47,48 @@
       }
     ]
   },
+  "config": {
+    "url": {
+      "type": "string",
+      "description": "The address the module's tools reach Icecast at, as a URL; unset, the code falls back to its environment, else this machine's Icecast on its port.",
+      "trusted": true,
+      "default": ""
+    },
+    "user": {
+      "type": "string",
+      "description": "The Icecast admin account the module's tools sign in as; unset, the code falls back to its environment, else admin.",
+      "trusted": true,
+      "default": ""
+    }
+  },
   "resources": [
     {
       "id": "mesh-state",
       "type": "directory",
       "mode": "0700",
-      "place": "mesh"
+      "place": "mesh",
+      "unknown": "program"
     },
     {
       "id": "state",
       "type": "directory",
       "mode": "0700",
-      "place": "."
+      "place": ".",
+      "unknown": "program"
     },
     {
       "id": "logs",
       "type": "directory",
       "mode": "0700",
-      "owner": "100:101"
+      "owner": "100:101",
+      "unknown": "program"
     },
     {
       "id": "server-conf",
       "type": "file",
       "path": "${dir:state}/icecast.xml",
       "mode": "0600",
-      "content": "<icecast>\n    <!-- Written by the mesh (modules/icecast). Passwords arrive as secrets rendered into this file,\n         never as environment: the image's entrypoint seds ICECAST_* variables into the file only\n         when they are set, and none are. -->\n    <location>Earth</location>\n    <admin>icemaster@localhost</admin>\n    <limits>\n        <clients>100</clients>\n        <sources>2</sources>\n        <queue-size>524288</queue-size>\n        <client-timeout>30</client-timeout>\n        <header-timeout>15</header-timeout>\n        <source-timeout>10</source-timeout>\n        <burst-on-connect>1</burst-on-connect>\n        <burst-size>65535</burst-size>\n    </limits>\n    <authentication>\n        <source-password>${secret:source}</source-password>\n        <relay-password>${secret:relay}</relay-password>\n        <admin-user>admin</admin-user>\n        <admin-password>${secret:admin}</admin-password>\n    </authentication>\n    <!-- The name icecast writes into playlists (.m3u/.xspf: http://<hostname>:<port>/<mount>) and\n         would announce to YP (none configured). A machine's own name belongs to its assignment, and\n         an assignment merges only into JSON; this XML cannot take it, so the neutral default stays. -->\n    <hostname>localhost</hostname>\n    <listen-socket>\n        <port>8000</port>\n    </listen-socket>\n    <http-headers>\n        <header name=\"Access-Control-Allow-Origin\" value=\"*\" />\n    </http-headers>\n    <fileserve>1</fileserve>\n    <paths>\n        <basedir>/usr/share/icecast</basedir>\n        <logdir>/var/log/icecast</logdir>\n        <webroot>/usr/share/icecast/web</webroot>\n        <adminroot>/usr/share/icecast/admin</adminroot>\n        <alias source=\"/\" destination=\"/status.xsl\"/>\n    </paths>\n    <logging>\n        <accesslog>access.log</accesslog>\n        <errorlog>error.log</errorlog>\n        <loglevel>3</loglevel>\n        <logsize>10000</logsize>\n    </logging>\n    <security>\n        <chroot>0</chroot>\n        <!-- Starts as root, reads this 0600 root-owned file, then drops to the image's icecast user\n             (uid 100, group icecast 101) before serving. -->\n        <changeowner>\n            <user>icecast</user>\n            <group>icecast</group>\n        </changeowner>\n    </security>\n</icecast>\n"
+      "template": "files/icecast.xml"
     },
     {
       "id": "net",
@@ -100,8 +117,9 @@
       "type": "file",
       "path": "${dir:mesh-state}/config.json",
       "mode": "0600",
-      "content": "{}\n",
-      "merge": "json"
+      "template": "files/config.json",
+      "merge": "json",
+      "takes-config": ["url", "user"]
     }
   ],
   "build": {
@@ -120,8 +138,14 @@
         ],
         "env": {
           "MESH_ICECAST_URL": "http://127.0.0.1:${port:8000}",
-          "MESH_ICECAST_CONFIG_FILE": "${dir:mesh-state}/config.json"
+          "MESH_ICECAST_CONFIG_FILE": "${dir:mesh-state}/config.json",
+          "MESH_ICECAST_ADMIN_PASSWORD_FILE": "${dir:state}/admin.secret"
         }
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
       }
     ]
   }