ci: Push to mirror repo with github actions

.github/workflows/mirror.yml

@@ -0,0 +1,47 @@
+# REF: https://github.com/JamesRobionyRogers/GitHub-to-GitBucket-Action/blob/47a44e9/.github/workflows/push-to-gitbucket.yml
+name: Mirror Repository
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+
+jobs:
+  mirror:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+
+      - name: Fetch all branches
+        run: |
+          git fetch --all
+          git fetch --tags
+
+      - name: List branches
+        run: |
+          git branch -a
+
+      # Enables tracking of remote branches ensuring all branches are pushed to mirror repo
+      - name: Track remote branches
+        run: |
+          for branch in $(git branch -r | grep -v '\->'); do
+            local_branch=${branch#origin/}
+            git branch --track "$local_branch" "$branch" || true
+          done
+
+      - name: Push to mirror repo (GitLab)
+        env:
+          MIRROR_URL: "gitlab.com/null2264/yokai.git"
+          MIRROR_USERNAME: ${{ secrets.MIRROR_USERNAME }}
+          MIRROR_AUTH: ${{ secrets.MIRROR_AUTH }}
+        run: |
+          git config --global user.name "GitHub Actions"
+          git config --global user.email "actions@github.com"
+
+          git remote add mirror https://$MIRROR_USERNAME:$MIRROR_AUTH@$MIRROR_URL
+          git push --mirror -v mirror