diff --git a/Dockerfile b/Dockerfile
index 110bb72..63d8f9d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,9 +2,11 @@ FROM caddy:alpine
 
 WORKDIR /usr/share/caddy/
 
-# setup single `rewrite` rule in std. caddy config
-RUN sed -i 's/file_server/file_server\n  rewrite \/details\/ index.html/' /etc/caddy/Caddyfile
-
-RUN cat /etc/caddy/Caddyfile
+# setup single `rewrite` rule in std. caddy config:
+#   rewrite  /details/*  /index.html
+RUN sed -i 's/file_server/file_server\n  rewrite \/details\/* \/index.html/' /etc/caddy/Caddyfile
 
 COPY . .
+
+# pick some non-root user that `caddy` will run as
+USER ftp