Set LANG=C.UTF-8 by default.

Author: psftw

8.10/buster/Dockerfile

@@ -1,5 +1,7 @@
 FROM debian:buster
 
+ENV LANG C.UTF-8
+
 RUN apt-get update && \
     apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr && \
     rm -rf /var/lib/apt/lists/*

8.10/stretch/Dockerfile

@@ -1,5 +1,7 @@
 FROM debian:stretch
 
+ENV LANG C.UTF-8
+
 RUN apt-get update && \
     apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr && \
     rm -rf /var/lib/apt/lists/*

8.8/buster/Dockerfile

@@ -1,5 +1,7 @@
 FROM debian:buster
 
+ENV LANG C.UTF-8
+
 RUN apt-get update && \
     apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr && \
     rm -rf /var/lib/apt/lists/*

8.8/stretch/Dockerfile

@@ -1,5 +1,7 @@
 FROM debian:stretch
 
+ENV LANG C.UTF-8
+
 RUN apt-get update && \
     apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr && \
     rm -rf /var/lib/apt/lists/*