Add GitHub Actions workflow for .NET tool publishing

This workflow publishes the .NET tool to NuGet using Trusted Publishing (OIDC). It includes steps for checkout, setup, restoring dependencies, building, testing, packing, and publishing.

Author: asklar

.github/workflows/publish-dotnet.yml

@@ -0,0 +1,72 @@
+name: Publish .NET Tool
+
+# This workflow publishes the .NET tool to NuGet using Trusted Publishing (OIDC).
+# 
+# Setup required on NuGet.org:
+# 1. Navigate to your package page at https://www.nuget.org/packages/Mcpb.Cli/
+# 2. Go to "Manage Package" and select "Publishing" or "Trusted publishers"
+# 3. Click "Add" to configure a new trusted publisher
+# 4. Configure the GitHub Actions OIDC settings:
+#    - Subject Repository: asklar/mcpb
+#    - Subject Workflow: .github/workflows/publish-dotnet.yml
+#    - Subject Environment: nuget (optional but recommended)
+# 5. Save the trusted publisher configuration
+# 
+# Setup required in GitHub:
+# 1. Create an environment named "nuget" in repository settings
+# 2. Add protection rules if desired (e.g., required reviewers)
+# 
+# The workflow will run automatically when the version in dotnet/mcpb/mcpb.csproj is changed
+# and pushed to the dotnet branch, or it can be triggered manually.
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - dotnet
+    paths:
+      - 'dotnet/mcpb/mcpb.csproj'
+
+permissions:
+  contents: read
+  id-token: write
+
+jobs:
+  publish:
+    name: Publish to NuGet
+    runs-on: ubuntu-latest
+    environment: nuget
+    
+    steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      
+      - name: Setup .NET
+        uses: actions/setup-dotnet@3e891b0cb619bf60e2c25674b222b8940e2c1c25 # v4.1.0
+        with:
+          dotnet-version: '8.0.x'
+      
+      - name: Restore dependencies
+        run: |
+          cd dotnet
+          dotnet restore
+      
+      - name: Build
+        run: |
+          cd dotnet
+          dotnet build -c Release --no-restore
+      
+      - name: Test
+        run: |
+          cd dotnet
+          dotnet test -c Release --no-build --verbosity normal
+      
+      - name: Pack
+        run: |
+          cd dotnet/mcpb
+          dotnet pack -c Release --no-build --output ./artifacts
+      
+      - name: Publish to NuGet
+        run: |
+          cd dotnet/mcpb
+          dotnet nuget push ./artifacts/*.nupkg --api-key oy2p --source https://api.nuget.org/v3/index.json --skip-duplicate