Use pipefail in dry-run workflow

[Kobzol]

See https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#defaultsrunshell.

[github-actions]

Dry-run check results

[2025-03-07T08:03:38Z WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[2025-03-07T08:03:38Z INFO  sync_team] synchronizing github
[2025-03-07T08:04:43Z ERROR sync_team] failed: Failed to decode response body on GET request to 'https://api.github.com/repos/rust-lang/async-crashdump-debugging-initiative'
[2025-03-07T08:04:43Z ERROR sync_team] caused by: Cannot deserialize type `sync_team::github::api::Repo` from the following response body:
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[2025-03-07T08:04:43Z ERROR sync_team] caused by: invalid type: null, expected a string at line 1 column 1253