switch buckets

[jay-418]

Prefer generic buckets.

solves https://github.com/getlantern/engineering/issues/3080

Warning

When this is merged, we must

• update the env var to match: S3_RELEASES_BUCKET=lantern.io
• update website links (@Derekf5?)
• update downloads page update bucket and depreacate release notes .github#12

[Copilot]

Pull request overview

Updates CI release tooling to use a more generic S3 URL format and improves Slack messaging for nightly builds by linking to the workflow run.

Changes:

• Switch displayed S3 download URLs from virtual-hosted style (${bucket}.s3.amazonaws.com) to path-style (s3.amazonaws.com/${bucket}) in CI scripts.
• Add WORKFLOW_URL support to Slack message formatting and use it for nightly announcements.
• Change the release workflow to source BUCKET from secrets.S3_RELEASES_BUCKET and propagate WORKFLOW_URL.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
scripts/ci/publish-to-s3.sh	Updates the printed S3 URLs after upload to use path-style URLs.
scripts/ci/format.sh	Updates S3 URLs and adjusts Slack message formatting to use WORKFLOW_URL for nightly builds.
.github/workflows/release.yml	Switches BUCKET to come from secrets and adds WORKFLOW_URL env wiring for Slack formatting.

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