Brad WarrenandGitHub b4e955a60e Switch away from ubuntu-latest (#8606) ...

I noticed warnings on Azure like [this](https://dev.azure.com/certbot/certbot/_build/results?buildId=3311&view=logs&j=d74e04fe-9740-597d-e9fa-1d0400037dfd) which say:

> ##[warning]Ubuntu-latest pipelines will use Ubuntu-20.04 soon. For more details, see https://github.com/actions/virtual-environments/issues/1816

I was worried about us suddenly switching to Ubuntu 20.04 and things breaking so I tested that `ubuntu-20.04` works and am opening this PR to switch things over explicitly now. I'd rater have our VM images pinned to specific versions than a generic version specification like `latest` which might see an upgrade and break our tests unexpectedly.

I ran the notification code on Ubuntu 20.04 at https://dev.azure.com/certbot/certbot/_build/results?buildId=3315&view=results and you can see the notification at https://opensource.eff.org/eff-open-source/pl/ojjhde5j4jyw7dcurd5zfduymr.

2021-01-25 15:20:51 -08:00

..

templates

Switch away from ubuntu-latest (#8606)

2021-01-25 15:20:51 -08:00

advanced-test.yml

Docker build improvements (#8218)

2020-08-18 10:48:01 -07:00

INSTALL.md

Spelling and grammar fixes (#7695)

2020-01-17 18:55:51 +01:00

main.yml

Automatically Catch Sphinx Errors (#8530)

2021-01-07 20:26:59 +01:00

nightly.yml

Docker build improvements (#8218)

2020-08-18 10:48:01 -07:00

release.yml

Docker build improvements (#8218)

2020-08-18 10:48:01 -07:00