[DEPLOY] Include Caddyfile for Docker deployment

deploy/deploy-docker/Caddyfile

@@ -0,0 +1,16 @@
+:80 :443 {
+    root * /srv
+    file_server
+
+    @proxy_paths {
+        not path /static/*
+        not path /media/*
+    }
+
+    reverse_proxy @proxy_paths http://server:8000
+
+    log {
+        output stderr
+        format console
+    }
+}