fix: add system dependencies for git2 crate in CI

.gitea/workflows/ci.yml

@@ -14,6 +14,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Install system dependencies
+        run: |
+          apt-get update
+          apt-get install -y --no-install-recommends pkg-config libssl-dev
+
       - name: Set up Rust
         uses: actions-rs/toolchain@v1
         with: