ci: Fix docs release failing on detached HEAD

[vdusek]

Summary

Same fix as apify/apify-client-python#741 — the SDK workflows have the identical bug.

When manual_release_docs.yaml is invoked with a commit SHA as ref (from doc_release_post_publish in on_master.yaml or from manual_release_stable.yaml), actions/checkout leaves the repo in detached HEAD state and the hand-rolled Commit the updated package.json and lockfile step's git push fails with fatal: You are not currently on a branch.

The same latent bug exists in manual_version_docs.yaml's EndBug/add-and-commit step (no new_branch set). Neither has fired yet because no feat/fix/perf/refactor/style commit has landed on master since the reusable-workflow extraction merged.

Fix

• Replace the hand-rolled git block in manual_release_docs.yaml with EndBug/add-and-commit@v10.
• Set new_branch: ${{ github.event.repository.default_branch }} in both workflows — EndBug does not handle detached HEAD by itself (its default push is git push origin --set-upstream with no refspec, which fails the same way). Setting new_branch makes it create/checkout a local default branch at current HEAD before committing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.64%. Comparing base (87da1c2) to head (6abec8f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #866   +/-   ##
=======================================
  Coverage   86.64%   86.64%           
=======================================
  Files          48       48           
  Lines        2920     2920           
=======================================
  Hits         2530     2530           
  Misses        390      390           

Flag	Coverage Δ
e2e	37.87% <ø> (ø)
integration	59.28% <ø> (ø)
unit	74.69% <ø> (ø)

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