dev: fix requirement for auth to GitHub package source

.github/workflows/publish_ci.yml

@@ -7,6 +7,7 @@ on:
 
 env:
   CONFIGURATION: Release
+
 jobs:
   build:
     # Sets permissions of the GITHUB_TOKEN to allow release creating
@@ -15,14 +16,38 @@ jobs:
     environment:
       name: nuget
     runs-on: ubuntu-latest
+
     steps:
       - uses: actions/checkout@v3
+
       - name: Setup necessary dotnet SDKs
         uses: actions/setup-dotnet@v3
         with:
           global-json-file: global.json
           dotnet-version: |
             8.x
+
+      - name: Add the GitHub source
+        run: dotnet nuget add source --name "github.com" "https://nuget.pkg.github.com/fsprojects/index.json"
+
+      - name: Ensure NuGet package source mapping
+        run: |
+          $nugetConfigPath = "$HOME/.nuget/NuGet/NuGet.Config"
+          [xml]$nugetConfig = Get-Content $nugetConfigPath
+          if ($nugetConfig.configuration.packageSourceMapping -ne $null) {
+              $nugetConfig.configuration.packageSourceMapping.RemoveAll()
+          } else {
+              $packageSourceMapping = $nugetConfig.CreateElement("packageSourceMapping")
+              $nugetConfig.configuration.AppendChild($packageSourceMapping)
+          }
+          $nugetSource = $nugetConfig.CreateElement("packageSource")
+          $nugetSource.SetAttribute("key", "nuget.org")
+          $nugetPattern = $nugetConfig.CreateElement("package")
+          $nugetPattern.SetAttribute("pattern", "*")
+          $nugetSource.AppendChild($nugetPattern)
+          $nugetConfig.configuration.packageSourceMapping.AppendChild($nugetSource)
+          $nugetConfig.Save($nugetConfigPath)
+
       - name: Publish to GitHub
         env:
           NUGET_TOKEN: ${{ secrets.NUGET_TOKEN }}