Anders Kaseorg a58a71ef43 Remove Ubuntu 18.04 support. ... As a consequence: • Bump minimum supported Python version to 3.7. • Move Vagrant environment to Debian 10, which has Python 3.7. • Move CI frontend tests to Debian 10. • Move production build test to Debian 10. Signed-off-by: Anders Kaseorg <anders@zulip.com>		2022-01-21 17:26:14 -08:00
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Dockerfile	Remove Ubuntu 18.04 support.	2022-01-21 17:26:14 -08:00