arrow

GH-34543: [CI] Self-hosted ARM workflows improvements (#34512)

### Rationale for this change

Fixes some post-merge review comments

### What changes are included in this PR?

Comments from original: https://github.com/apache/arrow/pull/34482

### Are these changes tested?

On CI

* Closes: #34543

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>