chore(ci): fix uploads of release artifacts (#2891)

## Description

<!-- A summary of what this pull request achieves and a rough list of
changes. -->

## Breaking Changes

<!-- Optional, if there are any breaking changes document them,
including how to migrate older code. -->

## Notes & open questions

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## Change checklist

- [ ] Self-review.
- [ ] Documentation updates following the [style
guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text),
if relevant.
- [ ] Tests if relevant.
- [ ] All breaking changes documented.

Author: Arqu

.github/workflows/release.yml

@@ -255,6 +255,7 @@ jobs:
               ASSETS+="$staging.tar.gz,"
             done
             echo "ASSET=$(echo $ASSETS | sed 's/,$//')" >> $GITHUB_ENV
+            echo "ASSET_MULTI_LINE=$(echo $ASSETS | sed 's/,/\\n/g')" >> $GITHUB_ENV
 
         - name: Build archives (windows)
           if: matrix.os == 'windows-latest'
@@ -272,7 +273,9 @@ jobs:
               Set-Location -Path ..
             }
             $ASSETS = $ASSETS -join ','
+            $ASSETS_MULTI_LINE = $ASSETS -replace ',', "`n"
             Add-Content -Path $env:GITHUB_ENV -Value "ASSET=$ASSETS"
+            Add-Content -Path $env:GITHUB_ENV -Value "ASSET_MULTI_LINE=$ASSETS_MULTI_LINE"
 
         - uses: n0-computer/actions-upload-release-asset@main
           if: (github.event.inputs.upload_artifacts == 'true' || github.event_name == 'push')
@@ -284,7 +287,8 @@ jobs:
           uses: actions/upload-artifact@v4
           with:
             name: iroh-${{env.RELEASE_OS }}-${{env.RELEASE_ARCH}}-bundle
-            path: ${{ env.ASSET }}
+            path: |
+              ${{ env.ASSET_MULTI_LINE }}
             compression-level: 0
 
     docker: