Tweak docker base image, approval script, and sudoers file; add Docker section to README#124

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haikuginger wants to merge 2 commits intomasterfrom

jshapiro/update-docker-development

Commits on Jul 6, 2022

Tweak docker base image, approval script, and sudoers file; add Docker section to README
haikuginger
committed
Add README stanza regarding container cleanup
haikuginger
committed