ci: create release PR

Author: jinliu9508

.github/workflows/create-release-pr.yml

@@ -0,0 +1,110 @@
+name: Create Unity Release PR
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'New Unity SDK version (e.g. 5.4.0-alpha01 or 3.2.1)'
+        type: string
+        required: true
+      base_branch:
+        description: 'Target branch for the PR (e.g. main for regular releases, 5.4-main for patch releases)'
+        type: string
+        required: false
+        default: 'main'
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  create-unity-release:
+    runs-on: ubuntu-latest
+
+    env:
+      VERSION: ${{ github.event.inputs.version }}
+      BASE_BRANCH: ${{ github.event.inputs.base_branch || 'main' }}
+      BRANCH: release/${{ github.event.inputs.version }}
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - name: 📋 Display Configuration
+        run: |
+          echo "============================================"
+          echo "🎮 Creating Unity SDK Release"
+          echo "📦 Version: $VERSION"
+          echo "🎯 Base Branch (PR Target): $BASE_BRANCH"
+          echo "🌿 Release Branch (to create): $BRANCH"
+          echo "============================================"
+
+      - name: ✅ Validate Base Branch
+        run: |
+          if [[ "$BASE_BRANCH" == "main" ]]; then
+            echo "✅ Valid base branch: main"
+          elif [[ "$BASE_BRANCH" =~ ^[0-9]+\.[0-9]+-main$ ]]; then
+            echo "✅ Valid base branch: $BASE_BRANCH"
+          else
+            echo "❌ ERROR: Invalid base branch '$BASE_BRANCH'"
+            echo ""
+            echo "Base branch must be either:"
+            echo "  - 'main' (for regular releases)"
+            echo "  - 'X.Y-main' (for patch lines, e.g., 5.4-main)"
+            exit 1
+          fi
+
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+
+      - name: Create release branch from base
+        run: |
+          if git ls-remote --exit-code --heads origin "$BRANCH"; then
+            echo "Deleting remote branch $BRANCH"
+            git push origin --delete "$BRANCH"
+          fi
+
+          echo "Creating release branch $BRANCH from $BASE_BRANCH"
+          git checkout -b "$BRANCH" origin/$BASE_BRANCH
+
+      - name: Run composeRelease.sh
+        run: |
+          chmod +x ./composeRelease.sh
+          ./composeRelease.sh $VERSION
+        shell: bash
+
+      - name: Commit and Push version bump
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+
+          if git diff --quiet; then
+            echo "No version changes detected."
+          else
+            git commit -am "chore(release): prepare Unity SDK v$VERSION"
+            git push origin "$BRANCH"
+          fi
+
+      - name: Generate PR Body
+        run: |
+          echo "## 🎮 Unity SDK Release v$VERSION" > pr_body.md
+          echo "" >> pr_body.md
+          echo "**Summary:**" >> pr_body.md
+          echo "- Automated release PR created by CI." >> pr_body.md
+          echo "- Includes version bumps and changelog updates performed by composeRelease.sh." >> pr_body.md
+          echo "" >> pr_body.md
+          echo "**Next Steps:**" >> pr_body.md
+          echo "1. Review and approve this PR." >> pr_body.md
+          echo "2. Merge into \`$BASE_BRANCH\`." >> pr_body.md
+          echo "3. Verify the generated draft GitHub release and attach the updated *.unitypackage if needed." >> pr_body.md
+          echo "" >> pr_body.md
+          echo "_This PR was auto-generated by create-unity-release CI._" >> pr_body.md
+
+      - name: Create Pull Request
+        run: |
+          gh pr create \
+            --title "Release Unity SDK v$VERSION" \
+            --body-file pr_body.md \
+            --head "$BRANCH" \
+            --base "$BASE_BRANCH"