feat(ci): Add automatic release on tag push

New triggers:
- push to master: Run CI tests only
- push tags (v*): Auto-release to NuGet.org and create GitHub Release
- pull_request: Run CI tests only
- workflow_dispatch: Manual release with version input

Features:
✅ Auto-detect version from git tag (e.g., v1.0.0-preview)
✅ Support both tag push and manual trigger
✅ Only create new tag when manually triggered (not on tag push)
✅ Smart version handling with or without v prefix
✅ Automatic NuGet publish and GitHub Release creation

Usage:
1. Push tag: git tag v1.0.2-preview && git push origin v1.0.2-preview
2. Manual: Actions → CI → Run workflow → Enter version
3. CI only: Push to master or create PR

Author: claude

.github/workflows/main.yml

@@ -1,6 +1,11 @@
 name: CI
 
 on:
+  push:
+    branches: [ master ]
+    tags:
+      - 'v*'
+  
   pull_request:
     branches: [ master ]
 
@@ -27,58 +32,76 @@ jobs:
       - name: Install UPX
         run: brew install upx
 
-      - name: Prepare version strings
-        if: ${{ github.event.inputs.version != '' }}
+      - name: Determine version from tag or input
         id: version
         run: |
-          VERSION="${{ github.event.inputs.version }}"
-          # Remove 'v' prefix if present
-          VERSION_NO_V="${VERSION#v}"
-          echo "nuget_version=${VERSION_NO_V}" >> $GITHUB_OUTPUT
-          echo "git_tag=v${VERSION_NO_V}" >> $GITHUB_OUTPUT
-          echo "NuGet Version: ${VERSION_NO_V}"
-          echo "Git Tag: v${VERSION_NO_V}"
+          if [[ "${{ github.ref }}" == refs/tags/* ]]; then
+            # Triggered by tag push
+            VERSION="${{ github.ref_name }}"
+            echo "Triggered by tag: ${VERSION}"
+          elif [[ -n "${{ github.event.inputs.version }}" ]]; then
+            # Triggered by workflow_dispatch
+            VERSION="${{ github.event.inputs.version }}"
+            echo "Triggered by workflow_dispatch: ${VERSION}"
+          else
+            # Triggered by push to master or PR
+            VERSION=""
+            echo "Triggered by push/PR: No version"
+          fi
+          
+          if [[ -n "${VERSION}" ]]; then
+            # Remove 'v' prefix if present for NuGet
+            VERSION_NO_V="${VERSION#v}"
+            echo "nuget_version=${VERSION_NO_V}" >> $GITHUB_OUTPUT
+            echo "git_tag=v${VERSION_NO_V}" >> $GITHUB_OUTPUT
+            echo "should_release=true" >> $GITHUB_OUTPUT
+            echo "NuGet Version: ${VERSION_NO_V}"
+            echo "Git Tag: v${VERSION_NO_V}"
+          else
+            echo "should_release=false" >> $GITHUB_OUTPUT
+            echo "No release will be created"
+          fi
       
-      - name: Build Package (CI)
-        if: ${{ github.event.inputs.version == '' }}
+      - name: Build Package (CI - No Release)
+        if: ${{ steps.version.outputs.should_release != 'true' }}
         run: |
           dotnet build -t:Pack src/PublishAotCompressed.macOS.nuproj
       
       - name: Test - Build for macOS (should skip UPX)
-        if: ${{ github.event.inputs.version == '' }}
+        if: ${{ steps.version.outputs.should_release != 'true' }}
         run: |
           dotnet publish -r osx-arm64 -c Release test/Hello.csproj
           ls -lh test/bin/Release/net9.0/osx-arm64/publish/
       
-      - name: Build Package (CD)
-        if: ${{ github.event.inputs.version != '' }}
+      - name: Build Package (Release)
+        if: ${{ steps.version.outputs.should_release == 'true' }}
         run: dotnet build -t:Pack src/PublishAotCompressed.macOS.nuproj -p:Version=${{ steps.version.outputs.nuget_version }}
 
       - name: Archive NuGet Package
-        if: ${{ github.event.inputs.version != '' }}
+        if: ${{ steps.version.outputs.should_release == 'true' }}
         uses: actions/upload-artifact@v4
         with:
           name: PublishAotCompressed.macOS.${{ steps.version.outputs.nuget_version }}.nupkg
           path: src/bin/Debug/PublishAotCompressed.macOS.${{ steps.version.outputs.nuget_version }}.nupkg
 
       - name: Publish to NuGet.org
-        if: ${{ github.event.inputs.version != '' }}
+        if: ${{ steps.version.outputs.should_release == 'true' }}
         run: |
           dotnet nuget push src/bin/Debug/PublishAotCompressed.macOS.${{ steps.version.outputs.nuget_version }}.nupkg \
             --api-key ${{ secrets.NUGET_API_KEY }} \
             --source https://api.nuget.org/v3/index.json \
             --skip-duplicate
       
       - name: Create Release Tag
-        if: ${{ github.event.inputs.version != '' }}
+        if: ${{ steps.version.outputs.should_release == 'true' && github.event_name == 'workflow_dispatch' }}
         run: |
           git config user.name github-actions
           git config user.email github-actions@github.com
           git tag ${{ steps.version.outputs.git_tag }}
           git push origin ${{ steps.version.outputs.git_tag }}
       
       - name: Create GitHub Release
-        if: ${{ github.event.inputs.version != '' }}
+        if: ${{ steps.version.outputs.should_release == 'true' }}
         uses: softprops/action-gh-release@v1
         with:
           tag_name: ${{ steps.version.outputs.git_tag }}