Fix build_arm_runner artifact names, to be unique

Author: michaliskambi

.github/workflows/build.yml

@@ -200,7 +200,7 @@ jobs:
       - name: Archive Artifacts
         uses: actions/upload-artifact@v4
         with:
-          name: raspberry-pi-${{ matrix.runner }}-build
+          name: raspberry-pi-${{ matrix.arch }}-build
           path: |
             *.zip
             *.tar.gz