Fix CI: replace sodiumoxide with pure-Rust crypto libraries (aes-gcm, sha2, hkdf)

.gitea/workflows/ci.yml

@@ -14,3 +14,9 @@ jobs:
       
       - name: Build
         run: cargo build --all-features --verbose
+      
+      - name: Run tests
+        run: cargo test --verbose
+      
+      - name: Check formatting
+        run: cargo fmt -- --check