matrix: add initial conduit-only config

roles/matrix-web/meta/main.yml

@@ -0,0 +1,3 @@
+---
+dependencies:
+  - role: caddy

roles/matrix-web/tasks/main.yml

@@ -0,0 +1,9 @@
+---
+- name: Ensure Caddyfile is present
+  template:
+    src: 'matrix.Caddyfile.j2'
+    dest: '/etc/caddy/matrix.Caddyfile'
+    owner: root
+    group: root
+    mode: '0644'
+  notify: caddy-reload

roles/matrix-web/templates/matrix.Caddyfile.j2

@@ -0,0 +1,3 @@
+matrix.rustybever.be {
+    reverse_proxy {{ hostvars[groups['matrix'][0]].static_ip }}:8004
+}