tests/ci: set locale in deploy.sh

This hides warnings that are seen whenever dnf is called and also it is
no longer possible to initialize postresql database without it which is
used in base tests now.

schutzbot/deploy.sh

@@ -9,6 +9,10 @@ set -euxo pipefail
 # pull the -test package from.
 PROJECT=${1:-osbuild-composer}
 
+# set locale to en_US.UTF-8
+sudo dnf install -y glibc-langpack-en
+localectl set-locale LANG=en_US.UTF-8
+
 # Colorful output.
 function greenprint {
     echo -e "\033[1;32m${1}\033[0m"