简化镜像仓库同步 workflow (#5004)

.github/workflows/mirror.yml

@@ -0,0 +1,29 @@
+name: Mirror Repository
+
+on:
+  workflow_dispatch:
+  workflow_call:
+  push:
+
+jobs:
+  mirror:
+    strategy:
+      matrix:
+        target:
+          - name: Gitee
+            repo: gitee.com/huanghongxun/HMCL
+            user: 'GITEE_SYNC_USERNAME'
+            token: 'GITEE_SYNC_TOKEN'
+          - name: CNB
+            repo: cnb.cool/HMCL-dev/HMCL
+            user: 'CNB_SYNC_USERNAME'
+            token: 'CNB_SYNC_TOKEN'
+    name: Mirror to ${{ matrix.target.name }}
+    if: ${{ github.repository == 'HMCL-dev/HMCL' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Mirror GitHub to ${{ matrix.target.name }}
+        run: |
+          git clone --mirror "https://github.com/$GITHUB_REPOSITORY.git" -- repo
+          cd repo
+          git push -f --prune "https://${{ secrets[matrix.target.user] }}:${{ secrets[matrix.target.token] }}@${{ matrix.target.repo }}.git" "refs/heads/*:refs/heads/*" "refs/tags/*:refs/tags/*"