Apply tuning to nightly package sync workflows

[cityofships]

• Run at most one workflow at a time [1];
• Start package syncs earlier so there's less chance of overlapping with daytime jobs.

[1] - https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#concurrency

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.