feat(reverse_proxy): raw-directive route type; wire NetBird (gRPC/WS) route

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

inventories/production/group_vars/all/reverse_proxy.yml

@@ -3,4 +3,15 @@
 reverse_proxy__acme_email: admin@wingu.me
 reverse_proxy__routes:
   - {host: test.askari.wingu.me, respond: "boma reverse proxy"}
-  # M4b appends: {host: netbird.askari.wingu.me, upstream: "netbird-dashboard:80"}
+  # NetBird control plane (M4b). gRPC (h2c) + WebSocket + path-based routing to two
+  # backend containers on the shared `boma` Docker network (ADR-024, ADR-016).
+  - host: netbird.askari.wingu.me
+    caddy: |
+      # gRPC needs HTTP/2 cleartext (h2c) to the backend
+      @grpc header Content-Type application/grpc*
+      reverse_proxy @grpc h2c://netbird-server:80
+      # management REST, embedded IdP, relay + ws-proxy (WebSocket) — same backend
+      @backend path /relay* /ws-proxy/* /api/* /oauth2/*
+      reverse_proxy @backend netbird-server:80
+      # dashboard SPA (everything else)
+      reverse_proxy /* netbird-dashboard:80

roles/reverse_proxy/molecule/default/converge.yml

@@ -11,6 +11,10 @@
         upstream: "app:80"
       - host: t.example.test
         respond: "ok"
+      - host: grpc.example.test
+        caddy: |
+          @grpc header Content-Type application/grpc*
+          reverse_proxy @grpc h2c://backend:80
 
   roles:
     - role: reverse_proxy

roles/reverse_proxy/molecule/default/verify.yml

@@ -15,5 +15,7 @@
           - "'app.example.test' in (_caddyfile.content | b64decode)"
           - "'reverse_proxy app:80' in (_caddyfile.content | b64decode)"
           - "'respond \"ok\" 200' in (_caddyfile.content | b64decode)"
+          - "'grpc.example.test' in (_caddyfile.content | b64decode)"
+          - "'reverse_proxy @grpc h2c://backend:80' in (_caddyfile.content | b64decode)"
         fail_msg: "Caddyfile is missing expected content"
         success_msg: "Caddyfile rendered correctly"

roles/reverse_proxy/templates/Caddyfile.j2

@@ -9,11 +9,13 @@
 {% endif %}
 }
 {% for r in reverse_proxy__routes %}
-{{ r.host }} {
-{% if r.upstream is defined %}
-  reverse_proxy {{ r.upstream }}
+{{ r['host'] }} {
+{% if r['caddy'] is defined %}
+{{ r['caddy'] | trim | indent(2, first=true) }}
+{% elif r['upstream'] is defined %}
+  reverse_proxy {{ r['upstream'] }}
 {% else %}
-  respond "{{ r.respond | default('boma') }}" 200
+  respond "{{ r['respond'] | default('boma') }}" 200
 {% endif %}
 }
 {% endfor %}