notify-slack: Migrate away from files.upload

[joverlee521]

Per Slack's notification

March 11, 2025

• Support for the files.upload API will be discontinued.

To prepare for this change, we recommend migrating away from files.upload and instead using the combination of files.getUploadURLExternal and files.completeUploadExternal. More information on how to use these two APIs together can be found on our Working with files documentation. You can also leverage Slack's SDKs to help you transition to this new way of uploading files by visiting our api.slack page.

TODOs

• merge notify-slack: Migrate to new upload APIs #47
• update pathogen repos to use channel id for SLACK_CHANNELS envvar
  • org envvar TEST_SLACK_CHANNEL is already the channel id
  • forecasts-ncov - SLACK_CHANNELS already using channel id
  • mpox - SLACK_CHANNELS already using channel id
  • ncov - slack_channel in multiple builds.yaml ncov does not use the files.upload API
  • Update SLACK_CHANNELS envvar ncov-ingest#492
• update vendored scripts in pathogen repos
  • Update vendored/notify-slack ncov-ingest#494
  • Update ingest/vendored forecasts-ncov#130
  • Update ingest/vendored/notify-slack mpox#305

[joverlee521]

Just got another email about this today, I'll put it on my TODO's for the next two weeks.

[joverlee521]

Updated the pathogen repos that actively use the Slack notification scripts, leaving the others for now.