Publish to NuGet with Trusted Publishing

.github/workflows/release.yml

@@ -3,12 +3,14 @@ name: Release
 on:
   push:
     tags: [ "v*" ]
+  workflow_dispatch:
 
 permissions:
-  contents: write
+  contents: read
 
 jobs:
   release:
+    if: github.event_name == 'push'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
@@ -36,10 +38,57 @@ jobs:
       - name: Pack
         run: dotnet pack src/BabelQueue.Core/BabelQueue.Core.csproj -c Release -o artifacts
 
+      - name: Upload packages
+        uses: actions/upload-artifact@v7
+        with:
+          name: nupkg
+          # Same set the old inline push sent: dotnet nuget push also picks up the sibling .snupkg.
+          path: |
+            artifacts/*.nupkg
+            artifacts/*.snupkg
+          if-no-files-found: error
+          retention-days: 1
+
+      - name: Upload conformance results
+        uses: actions/upload-artifact@v7
+        with:
+          name: conformance-results
+          path: results.json
+          if-no-files-found: error
+          retention-days: 1
+
+  # Runs only after build + tests passed. The only job (besides the dry run) that can request
+  # an OIDC token, so third-party build/test code never sees ACTIONS_ID_TOKEN_REQUEST_*.
+  publish:
+    if: github.event_name == 'push'
+    needs: release
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      id-token: write
+    steps:
+      - name: Download packages
+        uses: actions/download-artifact@v8
+        with:
+          name: nupkg
+          path: artifacts
+
+      - name: Download conformance results
+        uses: actions/download-artifact@v8
+        with:
+          name: conformance-results
+          path: .
+
+      - name: NuGet login (Trusted Publishing)
+        id: nuget-login
+        uses: NuGet/login@v1
+        with:
+          user: ${{ vars.NUGET_USER }}
+
       - name: Publish to NuGet
         run: >
           dotnet nuget push "artifacts/*.nupkg"
-          --api-key "${{ secrets.NUGET_API_KEY }}"
+          --api-key "${{ steps.nuget-login.outputs.NUGET_API_KEY }}"
           --source https://api.nuget.org/v3/index.json
           --skip-duplicate
 
@@ -49,3 +98,28 @@ jobs:
           generate_release_notes: true
           files: results.json
           fail_on_unmatched_files: true
+
+  # Manual dry run: exercises only the NuGet Trusted Publishing login (no test, pack, push
+  # or GitHub release), so the nuget.org policy can be verified without cutting a version.
+  verify-trusted-publishing:
+    if: github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+    steps:
+      - name: NuGet login (Trusted Publishing)
+        id: nuget-login
+        uses: NuGet/login@v1
+        with:
+          user: ${{ vars.NUGET_USER }}
+
+      - name: Verify the short-lived API key was issued
+        env:
+          KEY: ${{ steps.nuget-login.outputs.NUGET_API_KEY }}
+        run: |
+          if [ -n "$KEY" ]; then
+            echo "Trusted Publishing login OK"
+          else
+            echo "Trusted Publishing login returned an empty API key" >&2
+            exit 1
+          fi