alpine: use root to avoid nosuid issue in ci

[trws]

problem: just like with el9 and noble, alpine requires user to be set to root in the dockerfile here to build right under qemu-user-static in CI

solution: add the user root line where required

Another mistake that only shows up once we get into master, and this one only sometimes. 🤦

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.4%. Comparing base (37215cf) to head (20d1f60). Report is 80 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1280 +/- ## ====================================== Coverage 75.4% 75.4% ====================================== Files 111 111 Lines 15359 15359 ====================================== Hits 11588 11588 Misses 3771 3771 ```

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