che #13454 Adding Che 7 community images with support of arbitrary user to make them OpenShift compatible

[ibuziuk]

What does this PR do?

Adding a set of Che 7 images based on the community images with the support of arbitrary user [1] to make them compatible with OpenShift:

if ! whoami &> /dev/null; then
  if [ -w /etc/passwd ]; then
    echo "${USER_NAME:-default}:x:$(id -u):0:${USER_NAME:-default} user:${HOME}:/sbin/nologin" >> /etc/passwd
  fi
fi

[1] https://docs.okd.io/3.11/creating_images/guidelines.html#openshift-specific-guidelines

What issues does this PR fix or reference?

eclipse-che/che#13454

[ibuziuk]

Closing in favour of eclipse-che/che-devfile-registry#24