feat(ci): add main build, PR validation, and release workflows

.github/workflows/main-build.yml

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+name: Main Build
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  build-and-pack:
+    name: Build, Pack and Create Draft Release
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Required for GitVersion
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            8.0.x
+            9.0.x
+            10.0.x
+
+      - name: Restore dependencies
+        run: dotnet restore
+
+      - name: Build
+        run: dotnet build --configuration Release --no-restore
+
+      - name: Test
+        run: dotnet test --configuration Release --no-build --verbosity normal
+
+      - name: Pack NuGet packages
+        run: dotnet pack --configuration Release --no-build --output ./artifacts
+
+      - name: Get version from packages
+        id: get-version
+        run: |
+          # Extract version from the first package
+          VERSION=$(ls ./artifacts/*.nupkg | head -1 | sed -n 's/.*\.MyCSharp\.HttpUserAgentParser\.\([0-9]\+\.[0-9]\+\.[0-9]\+.*\)\.nupkg/\1/p')
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "Version: $VERSION"
+
+      - name: Check for existing draft release
+        id: check-draft
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          DRAFT_RELEASE=$(gh release list --limit 100 --json isDraft,name,tagName | jq -r '.[] | select(.isDraft == true) | .tagName' | head -1)
+          if [ -n "$DRAFT_RELEASE" ]; then
+            echo "exists=true" >> $GITHUB_OUTPUT
+            echo "tag=$DRAFT_RELEASE" >> $GITHUB_OUTPUT
+            echo "Found existing draft release: $DRAFT_RELEASE"
+          else
+            echo "exists=false" >> $GITHUB_OUTPUT
+            echo "No existing draft release found"
+          fi
+
+      - name: Delete existing draft release
+        if: steps.check-draft.outputs.exists == 'true'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          echo "Deleting existing draft release: ${{ steps.check-draft.outputs.tag }}"
+          gh release delete ${{ steps.check-draft.outputs.tag }} --yes --cleanup-tag || true
+
+      - name: Create draft release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          VERSION="${{ steps.get-version.outputs.version }}"
+          TAG="v${VERSION}"
+
+          # Create release notes
+          cat > release-notes.md << 'EOF'
+          ## What's Changed
+
+          This is an automated draft release created from the main branch.
+
+          ### Packages
+
+          The following NuGet packages are included in this release:
+
+          EOF
+
+          # List all packages
+          for file in ./artifacts/*.nupkg; do
+            filename=$(basename "$file")
+            echo "- \`$filename\`" >> release-notes.md
+          done
+
+          cat >> release-notes.md << 'EOF'
+
+          ### Installation
+
+          ```bash
+          dotnet add package MyCSharp.HttpUserAgentParser
+          dotnet add package MyCSharp.HttpUserAgentParser.AspNetCore
+          dotnet add package MyCSharp.HttpUserAgentParser.MemoryCache
+          ```
+
+          **Full Changelog**: https://github.com/${{ github.repository }}/commits/${{ github.sha }}
+          EOF
+
+          # Create draft release
+          gh release create "$TAG" \
+            ./artifacts/*.nupkg \
+            --draft \
+            --title "Release $VERSION" \
+            --notes-file release-notes.md \
+            --target ${{ github.sha }}
+
+          echo "Created draft release: $TAG"
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: nuget-packages
+          path: ./artifacts/*.nupkg
+          retention-days: 30

.github/workflows/pr-validation.yml

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+name: PR Validation
+
+on:
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  validate:
+    name: Build and Test
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        dotnet-version: ['8.0.x', '9.0.x', '10.0.x']
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Required for GitVersion
+
+      - name: Setup .NET ${{ matrix.dotnet-version }}
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: ${{ matrix.dotnet-version }}
+
+      - name: Restore dependencies
+        run: dotnet restore
+
+      - name: Build
+        run: dotnet build --configuration Release --no-restore
+
+      - name: Test
+        run: dotnet test --configuration Release --no-build --verbosity normal --logger "trx;LogFileName=test-results.trx"
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-${{ matrix.dotnet-version }}
+          path: '**/TestResults/**/*.trx'

.github/workflows/release-publish.yml

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+name: Publish Release
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  publish-nuget:
+    name: Publish to NuGet.org
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            8.0.x
+            9.0.x
+            10.0.x
+
+      - name: Restore dependencies
+        run: dotnet restore
+
+      - name: Build
+        run: dotnet build --configuration Release --no-restore
+
+      - name: Test
+        run: dotnet test --configuration Release --no-build --verbosity normal
+
+      - name: Pack NuGet packages
+        run: dotnet pack --configuration Release --no-build --output ./artifacts
+
+      - name: Verify packages
+        run: |
+          echo "Packages to be published:"
+          ls -la ./artifacts/*.nupkg
+
+          # Verify package count
+          PACKAGE_COUNT=$(ls ./artifacts/*.nupkg | wc -l)
+          if [ "$PACKAGE_COUNT" -eq 0 ]; then
+            echo "Error: No packages found!"
+            exit 1
+          fi
+
+          echo "Found $PACKAGE_COUNT package(s) to publish"
+
+      - name: Publish to NuGet.org
+        env:
+          NUGET_API_KEY: ${{ secrets.NUGET_API_KEY }}
+        run: |
+          for package in ./artifacts/*.nupkg; do
+            echo "Publishing $package to NuGet.org..."
+            dotnet nuget push "$package" \
+              --api-key "$NUGET_API_KEY" \
+              --source https://api.nuget.org/v3/index.json \
+              --skip-duplicate
+          done
+
+          echo "All packages published successfully!"
+
+      - name: Upload published packages as artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: published-nuget-packages
+          path: ./artifacts/*.nupkg
+          retention-days: 90