Update Password Creation to only create Chars (#750)

Author: michelroegl-brunner

install/umami-install.sh

@@ -37,7 +37,7 @@ msg_ok "Installed Node.js"
 msg_info "Setting up postgresql"
 DB_NAME=umamidb
 DB_USER=umami
-DB_PASS="$(openssl rand -base64 18 | cut -c1-13)"
+DB_PASS=$(openssl rand -base64 18 | tr -dc 'a-zA-Z0-9' | head -c13)
 SECRET_KEY="$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 32)"
 $STD sudo -u postgres psql -c "CREATE ROLE $DB_USER WITH LOGIN PASSWORD '$DB_PASS';"
 $STD sudo -u postgres psql -c "CREATE DATABASE $DB_NAME WITH OWNER $DB_USER ENCODING 'UTF8' TEMPLATE template0;"