fix: handle empty homebrew-mumei repo in update-homebrew job

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: AkiraTamai

.github/workflows/release.yml

@@ -181,11 +181,15 @@ jobs:
             echo "${name}: ${sha}"
           done
       - name: Checkout homebrew-mumei
-        uses: actions/checkout@v4
-        with:
-          repository: mumei-lang/homebrew-mumei
-          token: ${{ secrets.HOMEBREW_TAP_TOKEN }}
-          path: homebrew-mumei
+        env:
+          HOMEBREW_TAP_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
+        run: |
+          git clone "https://x-access-token:${HOMEBREW_TAP_TOKEN}@github.com/mumei-lang/homebrew-mumei.git" homebrew-mumei 2>/dev/null || {
+            mkdir -p homebrew-mumei
+            cd homebrew-mumei
+            git init -b main
+            git remote add origin "https://x-access-token:${HOMEBREW_TAP_TOKEN}@github.com/mumei-lang/homebrew-mumei.git"
+          }
       - name: Generate Homebrew Formula
         env:
           VERSION: ${{ github.ref_name }}
@@ -257,14 +261,18 @@ jobs:
             end
           end
           FORMULA_END
-      - name: Create PR to homebrew-mumei
-        uses: peter-evans/create-pull-request@v6
-        with:
-          token: ${{ secrets.HOMEBREW_TAP_TOKEN }}
-          path: homebrew-mumei
-          branch: update-formula/${{ github.ref_name }}
-          title: "Update Mumei formula to ${{ github.ref_name }}"
-          body: |
-            Automated update from [mumei-lang/mumei release ${{ github.ref_name }}](https://github.com/mumei-lang/mumei/releases/tag/${{ github.ref_name }}).
-          commit-message: "Update Mumei formula to ${{ github.ref_name }}"
-          delete-branch: true
+      - name: Push formula to homebrew-mumei
+        env:
+          HOMEBREW_TAP_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
+        run: |
+          cd homebrew-mumei
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add -A
+          if git diff --cached --quiet; then
+            echo "No changes to commit"
+            exit 0
+          fi
+          git commit -m "Update Mumei formula to ${{ github.ref_name }}"
+          # Push to main (handles both empty and existing repos)
+          git push origin HEAD:main