Set locale in AL3 helix image (#1427)

Author: richlander

src/azurelinux/3.0/helix/Dockerfile

@@ -43,6 +43,11 @@ RUN /usr/sbin/useradd -c '' --uid 1000 --shell /bin/bash --groups adm helixbot &
 
 USER helixbot
 
+# Set environment variables
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+
 # Install Helix Dependencies
 ENV VIRTUAL_ENV=/home/helixbot/.vsts-env
 RUN python3 -m venv $VIRTUAL_ENV