Update workflow to copy symlink instead of move it

Author: AnarchoBooleanism

.github/workflows/publish.yml

@@ -31,8 +31,9 @@ jobs:
             --format iso --system ${{ matrix.architecture }}-linux \
             --flake .#${{ matrix.architecture }} --out-link result
       - name: Rename generated ISO file to reflect version and architecture
-        run: >
-          mv $(find result/iso/ -name "nixos-*.iso" -print -quit) \
+        run: |
+          REAL_ISO_FILENAME = $(readlink -f $(find result/iso/ -name "nixos-*.iso" -print -quit))
+          cp "$REAL_ISO_FILENAME" \
             result/iso/nixos-cloud-init-installer-${{ github.ref_name }}-${{ matrix.architecture }}.iso
       - name: Upload build artifact
         uses: actions/upload-artifact@v4