git: add workflow for auto mirroring git.yzbruh.space/YZBruh/pmt-renovated.

.github/workflows/fetch-changes.yml

@@ -0,0 +1,25 @@
+name: Mirror External Repo to GitHub
+
+on:
+  schedule:
+    - cron: '0 * * * *'
+  workflow_dispatch:
+
+jobs:
+  mirror:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Mirror external repo
+        run: |
+          git config --global user.name "github-actions"
+          git config --global user.email "actions@github.com"
+          git clone --mirror https://git.yzbruh.space/YZBruh/pmt-renovated.git temp-mirror
+          cd temp-mirror
+          git remote add github https://github.com/ShawkTeam/pmt-renovated
+          git push --mirror github || true