allow nested paths in target-folder + add attempt-limit parameter

[databasedav]

Description

• Adds the --mkpath flag to the rsync command to allow it to make missing directories. This is useful when many different pages are being deployed, so a deeply nested descriptive path can be specified in target-folder. Right now, doing so leads to an error in rsync complaining about missing directories.
• Adds an attempt-limit parameter to allow more rebase/push attempts than the default of 3. This is useful when many different actions are racing to deploy many different pages.

Testing

I built this code (databasedav@ec82a36) and used it (https://github.com/databasedav/haalka/blob/18a199464edc9cf3eb3e04989b30893f970097f0/.github/workflows/preview_deploy.yaml#L21) in this PR databasedav/haalka#6. Note that the target-folder is a deeply nested path https://github.com/databasedav/haalka/pull/6/files#diff-05da7bfe214f8a02b4727e2f5970ac5b86684f522864a6917da71a3efa04ba13R27 and pushing is attempted more than 3 times https://github.com/databasedav/haalka/actions/runs/11870171025/job/33082157315#step:5:257.

One can see a deployed page here https://databasedav.github.io/haalka/pr_previews/6/webgpu/button/, note it requires a webgpu compatible browser (e.g. chrome, firefox nightly, not firefox stable) to work.

[JamesIves]

Changes look good to me, appreciate the contribution. Left a comment but I can work on merging this later this week.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.54%. Comparing base (3c4f14a) to head (fbab7ab).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1737   +/-   ##
=======================================
  Coverage   93.54%   93.54%           
=======================================
  Files           7        7           
  Lines         310      310           
  Branches       85       86    +1     
=======================================
  Hits          290      290           
  Misses         18       18           
  Partials        2        2           

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