Disable su/sudo access unless sudo explicitly enabled for a specific user using GRANT_SUDO.

Added s3 + spark session instructions

Manpage recipe

bump notebook, jupyterhub

with security fixes

Add DockerHub-links to README.md

Move tzdata to minimal-notebook and document it

Add link to Discourse

chown: add logging and a test

Signed-off-by: Brett Randall <javabrett@gmail.com>

Signed-off-by: Brett Randall <javabrett@gmail.com>

Signed-off-by: Brett Randall <javabrett@gmail.com>

[ci skip] stderr when no tty

[ci skip] Fix spark version check

Not in PATH

[ci skip] Improve manifests, update index page

[ci skip] Add package manifest support

Generates manifest pages and pushes them
to the docker-stacks GitHub wiki.
Does not update a global index of all builds yet.

Enable color terminal in common cases

devtools install_github does not work

Added clarification on the use of NB_UMASK, which only applies to the…

Balance closing quote in doc for CHOWN_EXTRA example.