playground: fix Dockerfile and improve documentation

Change-Id: I9724434863fed5a3325facacff55708b1290d2f7
4 files changed
tree: 6f490604ce4bfdbc7d291d2c02ebb86f99dc8ca5
  1. lib/
  2. profiles/
  3. runtimes/
  4. security/
  5. services/
  6. tools/