build: adjust actions checkout ref parameter on release

[bluetoothbot]

Summary

Use github.ref for checkout and create a local branch name so the release job succeeds in CI runs originating from forks. Mirrors the usb-devices fix (PR #70).

Closes #79

Changes

• Switch ref: ${{ github.head_ref || github.ref_name }} to ref: ${{ github.ref }} for actions/checkout.
• Add a Create local branch name step running git switch -C -- "$BRANCH" so PSR sees a named branch.

Test plan

• CI from a fork PR exercises the release job without failing on the checkout step.

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Generated by Kōan

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Quality Report

Changes: 1 file changed, 6 insertions(+), 1 deletion(-)

Code scan: clean

Tests: passed (2 passed)

Branch hygiene: clean

Generated by Kōan post-mission quality pipeline

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.68%. Comparing base (0184954) to head (9d6173b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   73.68%   73.68%           
=======================================
  Files           1        1           
  Lines          38       38           
  Branches        3        3           
=======================================
  Hits           28       28           
  Misses         10       10           

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