fix: Add full Rust CI pipeline (check, test, clippy)

.gitea/workflows/ci.yml

@@ -12,12 +12,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Check Rust installation
-        run: |
-          which cargo || echo "cargo not found"
-          cargo --version || echo "cargo not available"
+        run: cargo --version
       - name: Check compilation
-        run: |
-          cargo check --all-targets || echo "check failed"
+        run: cargo check --all-targets
       - name: Run tests
-        run: |
-          cargo test --all || echo "tests failed"
+        run: cargo test --all
+      - name: Run clippy
+        run: cargo clippy --all -- -D warnings