Update sudoers file to not include dots (#2080)

- Closes #1713.
- Files under /etc/sudoers.d/ must not contain dots as these
  will be ignored as "backup-files". When writing the sudoers
  file, replace `.` with `_` in the username to form the filename.

Author: tumd

Sources/Plugins/MachineAPIServer/Resources/create-user.sh

@@ -42,5 +42,6 @@ fi
 chown -R "${CONTAINER_UID}:${CONTAINER_GID}" "${CONTAINER_HOME}"
 
 mkdir -p /etc/sudoers.d
-echo "${CONTAINER_USER} ALL=(ALL) NOPASSWD:ALL" > "/etc/sudoers.d/${CONTAINER_USER}"
-chmod 440 "/etc/sudoers.d/${CONTAINER_USER}"
+sudoers_file=$(echo "${CONTAINER_USER}" | tr '.' '_')
+echo "${CONTAINER_USER} ALL=(ALL) NOPASSWD:ALL" > "/etc/sudoers.d/${sudoers_file}"
+chmod 440 "/etc/sudoers.d/${sudoers_file}"