fix: AdoptOpenJDK#179 - Proper locale in debian image (AdoptOpenJDK#180)

Author: grzesuav

.gitignore

@@ -2,3 +2,4 @@
 .idea/vcs.xml
 *_shasums_latest.sh
 manifest_commands.sh
+hadolint/

dockerfile_functions.sh

@@ -92,6 +92,7 @@ print_ubuntu_pkg() {
 	cat >> $1 <<'EOI'
 RUN apt-get update \
     && apt-get install -y --no-install-recommends curl ca-certificates locales \
+    && echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen \
     && locale-gen en_US.UTF-8 \
     && rm -rf /var/lib/apt/lists/*
 EOI