CI/CD: Added mirror workflow to codeberg

Author: theorzr

.github/workflows/mirror.yml

@@ -0,0 +1,36 @@
+name: Mirror
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+
+  mirror-codeberg:
+    name: Mirror to Codeberg.org
+    runs-on: ubuntu-latest
+    steps:
+
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      
+      - name: Setup SSH
+        shell: bash
+        env:
+          CODEBERG_SSH_KEY: ${{ secrets.CODEBERG_SSH_KEY }}
+          CODEBERG_SSH_FINGERPRINT: ${{ vars.CODEBERG_SSH_FINGERPRINT }}
+        run: |
+          mkdir ~/.ssh
+          chmod 0744 ~/.ssh
+          echo "$CODEBERG_SSH_KEY" > ~/.ssh/id_codeberg
+          echo "$CODEBERG_SSH_FINGERPRINT" >> ~/.ssh/known_hosts
+          chmod 0600 ~/.ssh/id_codeberg
+          chmod 0600 ~/.ssh/known_hosts
+
+      - name: Mirror
+        shell: bash
+        run: |
+          export GIT_SSH_COMMAND="ssh -i ~/.ssh/id_codeberg -o IdentitiesOnly=yes"
+          git remote add codeberg ssh://git@codeberg.org/portablemc/portablemc.git
+          git push --force --mirror codeberg