Add ability to publish pre-release Nuget packages (#34)

.github/workflows/publish_nuget.yml

@@ -17,7 +17,25 @@ jobs:
       - uses: actions/checkout@v3
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
-      - run: dotnet pack --configuration Release --output ${{env.NuGetDirectory}} -p:PackageVersion=${{github.event.release.tag_name}}
+      - name: Set version
+        id: set_version
+        shell: pwsh
+        run: |
+          echo "$version"
+          $version = "${{github.event.release.tag_name}}"
+          $isPrerelease = "${{github.event.release.prerelease}}" -eq "true"
+          $hasPrereleaseSuffix = $version -match "-\w+"
+          if ($isPrerelease -and -not $hasPrereleaseSuffix) {
+            Write-Error "Pre-release tag must contain a suffix (e.g., -alpha, -beta, -rc). Found: $version"
+            exit 1
+          }
+          
+          if (-not $isPrerelease -and $hasPrereleaseSuffix) {
+            Write-Error "Regular release tag must not contain a pre-release suffix. Found: $version"
+            exit 1
+          }
+          echo "VERSION=$version" >> $env:GITHUB_ENV
+      - run: dotnet pack --configuration Release --output ${{env.NuGetDirectory}} -p:PackageVersion=${{env.VERSION}}
       - uses: actions/upload-artifact@v3
         with:
           name: nuget