feat(workflows): add GitHub release synchronization workflow

- Introduces a workflow to sync Gitea releases with GitHub
- Supports manual dispatch and reacts to release events
- Utilizes secrets for secure token management

.gitea/workflows/sync-github.yml

@@ -0,0 +1,28 @@
+name: Sync Release to GitHub
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Release tag to synchronize"
+        required: false
+        type: string
+  release:
+    types: [published, edited]
+
+jobs:
+  sync-github:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Run Releases Sync Action
+        uses: https://git.0xmax42.io/actions/releases-sync@main
+        with:
+          gitea_token: ${{ secrets.RELEASE_PUBLISH_TOKEN }}
+          gitea_url: https://git.0xmax42.io
+          gitea_owner: maxp
+          gitea_repo: systemd-timer
+          tag_name: ${{ inputs.tag || github.event.release.tag_name }}
+          github_token: ${{ secrets.SYNC_GITHUB_TOKEN }}
+          github_owner: 0xmax42
+          github_repo: systemd-timer