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/keycloak/files/admin.env

@@ -0,0 +1,2 @@
+KEYCLOAK_ADMIN=admin
+KEYCLOAK_ADMIN_PASSWORD=${secret:admin}

testdata/beside/mesh-catalog/modules/keycloak/files/config.json

@@ -0,0 +1 @@
+{}

testdata/beside/mesh-catalog/modules/keycloak/files/consumers.json

@@ -0,0 +1 @@
+${consumers:oidc-client}

testdata/beside/mesh-catalog/modules/keycloak/files/database.env

@@ -0,0 +1,3 @@
+KC_DB_URL=jdbc:postgresql://${bound:postgres-database:at}:${bound:postgres-database:port}/${bound:postgres-database:as}
+KC_DB_USERNAME=${bound:postgres-database:as}
+KC_DB_PASSWORD=${secret:postgres-database}

testdata/beside/mesh-catalog/modules/keycloak/files/hostname.env

@@ -0,0 +1 @@
+KC_HOSTNAME=https://${bound:route:name}