[misc]: add http service proxy between ui and api

docker-compose.yml

@@ -1,6 +1,14 @@
 version: '2.1'
 services:
 
+    proxy:
+        image: katie/roleypoly-proxy:latest
+        ports:
+            - 6770:80
+        environment:
+            UI_ADDR: 172.17.0.1:6768
+            API_ADDR: 172.17.0.1:6769
+
     pg:
         image: postgres:10-alpine
         container_name: roleypoly-pg

etc/proxy/Dockerfile

@@ -0,0 +1,3 @@
+FROM haproxy:1.9-alpine
+ENV UI_ADDR=ui:6768 API_ADDR=api:6769
+COPY haproxy.cfg /usr/local/etc/haproxy/haproxy.cfg

etc/proxy/haproxy.cfg

@@ -0,0 +1,17 @@
+frontend www-incoming
+	bind :80
+	mode http
+	default_backend ui
+  acl api_req path -i -m beg /api
+  acl api_req path -i -m beg /magic
+  use_backend api if api_req
+
+backend ui
+	mode http
+	balance roundrobin
+	server server0 ${UI_ADDR} check
+
+backend api
+	mode http
+	balance roundrobin
+	server server0 ${API_ADDR} check