Merge pull request #61 from viktorianer/fix/lang-and-lc-all-encoding

Add `LANG` and `LC_ALL` environment variables.

Author: rafaelfranca

images/ruby/.devcontainer/Dockerfile

@@ -4,4 +4,7 @@ RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
     # Remove imagemagick due to https://security-tracker.debian.org/tracker/CVE-2019-10131
     && apt-get purge -y imagemagick imagemagick-6-common
 
+ENV LANG=C.UTF-8 \
+    LC_ALL=C.UTF-8
+
 USER vscode