fix(ci): make sudo invocation conditional in postgresql-client installation

.gitea/workflows/ci.yaml

@@ -49,7 +49,8 @@ jobs:
 
       - name: Setup test database
         run: |
-          sudo apt-get update -qq && sudo apt-get install -y -qq postgresql-client
+          if command -v sudo >/dev/null 2>&1; then SUDO="sudo"; else SUDO=""; fi
+          $SUDO apt-get update -qq && $SUDO apt-get install -y -qq postgresql-client
           for i in $(seq 1 30); do
             PGPASSWORD=memento_test pg_isready -h postgres -U memento_test -d memento_test && break
             [ "$i" -eq 30 ] && exit 1