GitHub Actions: Ubuntu 20.04 runner image deprecation/removal

[victorlin]

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The Ubuntu 20.04 runner image will be fully unsupported by April 1, 2025. To raise awareness of the upcoming removal, we will temporarily fail jobs using Ubuntu 20.04. Builds that are scheduled to run during the brownout periods will fail. The brownouts are scheduled for the following dates and times:

• March 4 14:00 UTC -- 22:00 UTC
• March 11 13:00 UTC -- 21:00 UTC
• March 18 13:00 UTC -- 21:00 UTC
• March 25 13:00 UTC -- 21:00 UTC

What you need to do

Jobs using the ubuntu-20.04 YAML workflow label should be updated to ubuntu-22.04, ubuntu-24.04 or ubuntu-latest. You can always get up-to-date information on our tools by reading about the software in the runner images repository. Please contact GitHub Support if you run into any problems or need help.

Tasks

Remove/replace usage of the ubuntu-20.04 runner image in these workflows. List extracted from GitHub query:

• nextstrain/cli · .github/workflows/ci.yaml
• nextstrain/cli · .github/workflows/standalone-installers.yaml
• nextstrain/conda-base · .github/workflows/installation.yaml
• nextstrain/nextclade_data · .github/workflows/build-and-deploy.yml
• nextstrain/test-github-actions · .github/workflows/preprocess-open.yml
• nextstrain/test-github-actions · .github/workflows/test.yml

[victorlin]

Proposals:

Keep the cli and conda-base usage until it starts failing, since those are part of a matrix that should be running on whatever is available.

Update test-github-actions usage to ubuntu-latest to avoid version bump churn on these test workflows that aren't frequently used.

Update nextclade_data usage to ubuntu-22.04 or ubuntu-24.04.

[joverlee521]

Update nextclade_data usage to ubuntu-22.04 or ubuntu-24.04.

Reminder that the ubuntu-24.04 runner image has breaking changes