Enable signing of artifacts

.github/workflows/publish.yaml

@@ -8,6 +8,9 @@ on:
     branches:
       - main
 
+permissions:
+  id-token: write
+
 env:
   DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
   DOTNET_CLI_TELEMETRY_OPTOUT: true
@@ -28,6 +31,13 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Azure login
+        uses: azure/login@v2
+        with:
+          client-id: ${{ secrets.AZURE_CLIENT_ID }}
+          tenant-id: ${{ secrets.AZURE_TENANT_ID }}
+          subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
+
       - name: Setup .NET SDK (global.json)
         uses: actions/setup-dotnet@v5
 
@@ -35,4 +45,7 @@ jobs:
         shell: bash
         run: |
           dotnet tool restore
-          dotnet make publish --nuget-key="${{secrets.NUGET_API_KEY}}"
+          dotnet make publish --sign \
+            --nuget-key="${{secrets.NUGET_API_KEY}}" \
+            --keyvaultUrl="${{secrets.SIGN_KEYVAULT_URL}}" \
+            --keyvaultCertificate="${{secrets.SIGN_KEYVAULT_CERTIFICATE}}"