ci: add repo mirroring workflow

- [add] Create new GitHub Actions workflow file (.github/workflows/repo-mirror.yml)
- [config] Set workflow name to "Repository Mirroring" (repo-mirror.yml:1)
- [config] Configure triggers for push/delete on main and workflow_dispatch (repo-mirror.yml:4-8)
- [add] Define 'mirror_to_gitlab' job running on ubuntu-latest (repo-mirror.yml:10-11)
- [ci] Add checkout step with fetch-depth: 0 to mirror_to_gitlab job (repo-mirror.yml:13-15)
- [config] Add "Configure Git" step to mirror_to_gitlab job (repo-mirror.yml:16-19)
- [config] Set SSH_PRIVATE_KEY and TARGET_URL envs from secrets for mirror_to_gitlab job (repo-mirror.yml:20-23)
- [ci] Add step to setup SSH and force push to target URL in mirror_to_gitlab job (repo-mirror.yml:24-30)
- [add] Define 'mirror_to_gitea' job running on ubuntu-latest (repo-mirror.yml:32-33)
- [ci] Add checkout step with fetch-depth: 0 to mirror_to_gitea job (repo-mirror.yml:35-37)
- [config] Add "Configure Git" step to mirror_to_gitea job (repo-mirror.yml:38-41)
- [config] Set SSH_PRIVATE_KEY and TARGET_URL envs from secrets for mirror_to_gitea job (repo-mirror.yml:42-45)
- [ci] Add step to setup SSH and force push to target URL in mirror_to_gitea job (repo-mirror.yml:46-52)

Author: nazdridoy

.github/workflows/repo-mirror.yml

@@ -0,0 +1,53 @@
+name: Repository Mirroring
+
+on:
+  push:
+    branches: [ "main" ]
+  delete:
+    branches: [ "main" ]
+  workflow_dispatch:  # Allows manual triggering
+
+jobs:
+  mirror_to_gitlab:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Configure Git
+        run: |
+          git config --global user.name "GitHub Actions"
+          git config --global user.email "[email protected]"
+      - name: Mirror to GitLab
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.GITLAB_SSH_PRIVATE_KEY }}
+          TARGET_URL: ${{ secrets.GITLAB_REPO_URL }}
+        run: |
+          mkdir -p ~/.ssh
+          echo "${SSH_PRIVATE_KEY}" > ~/.ssh/id_rsa
+          chmod 600 ~/.ssh/id_rsa
+          ssh-keyscan gitlab.com >> ~/.ssh/known_hosts
+          # Push local branches and tags, excluding remote refs
+          git push --force ${TARGET_URL} 'refs/heads/*:refs/heads/*' 'refs/tags/*:refs/tags/*'
+  
+  mirror_to_gitea:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Configure Git
+        run: |
+          git config --global user.name "GitHub Actions"
+          git config --global user.email "[email protected]"
+      - name: Mirror to Gitea
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.GITEA_SSH_PRIVATE_KEY }}
+          TARGET_URL: ${{ secrets.GITEA_REPO_URL }}
+        run: |
+          mkdir -p ~/.ssh
+          echo "${SSH_PRIVATE_KEY}" > ~/.ssh/id_rsa
+          chmod 600 ~/.ssh/id_rsa
+          ssh-keyscan -t rsa $(echo ${TARGET_URL} | cut -d '@' -f 2 | cut -d ':' -f 1) >> ~/.ssh/known_hosts
+          # Push local branches and tags, excluding remote refs
+          git push --force ${TARGET_URL} 'refs/heads/*:refs/heads/*' 'refs/tags/*:refs/tags/*'