Use noninteractive frontend when installing packages

to silence 'unable to initialize frontend' messages

Dockerfile

@@ -1,7 +1,8 @@
 FROM debian:unstable
 
 RUN apt-get update \
- && apt-get install -q -y locales git curl ripgrep tree-sitter-cli build-essential neovim
+  && DEBIAN_FRONTEND=noninteractive apt-get install -q -y \
+    locales git curl ripgrep tree-sitter-cli build-essential neovim
 
 RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen \
   && locale-gen