ci: make GitHub Packages push owner-agnostic (org-transfer prep)

Use github.repository_owner instead of the hardcoded sunnamed434 so the nightly
nuget.pkg.github.com push follows the repo after transfer to the org.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: sunnamed434

.github/actions/project-build/action.yaml

@@ -103,7 +103,7 @@ runs:
     # Push to GitHub packages on each commit and release (Nightly)
     - name: Push to NuGet (Nightly)
       run: if ${{ inputs.nuget_push == 'true' && (github.event_name == 'push' || (github.event_name == 'create' && github.event.ref_type == 'tag')) }}; then
-        dotnet nuget push ${{ inputs.project_path }}/bin/Release/*.nupkg --api-key ${{ inputs.github_token }} --skip-duplicate --source https://nuget.pkg.github.com/sunnamed434/index.json;
+        dotnet nuget push ${{ inputs.project_path }}/bin/Release/*.nupkg --api-key ${{ inputs.github_token }} --skip-duplicate --source https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json;
         fi
       shell: bash
 

.github/workflows/BitMono.Integration.yaml

@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: read     # checkout
-      packages: write    # dotnet nuget push -> nuget.pkg.github.com/sunnamed434
+      packages: write    # dotnet nuget push -> nuget.pkg.github.com/<owner>
       id-token: write   # OIDC for NuGet Trusted Publishing
 
     steps: