Update build-ubuntu.yml

Author: NPO-197

.github/workflows/build-ubuntu.yml

@@ -10,7 +10,6 @@ on:
       - master
 
 env:
-  LUA_DIR: ./lua
   MELONDS_GIT_BRANCH: ${{ github.ref }}
   MELONDS_GIT_HASH: ${{ github.sha }}
   MELONDS_BUILD_PROVIDER: GitHub Actions
@@ -38,6 +37,7 @@ jobs:
         luaVersion: "5.5.0"
 
     - name: Install dependencies
+      run: whereis lua
       run: |
         sudo apt update
         sudo apt install --allow-downgrades cmake ninja-build extra-cmake-modules libpcap0.8-dev libsdl2-dev libenet-dev \