Fix Windows and Linux builds in CI

Author: sharkwouter

.github/workflows/build.yml

@@ -15,17 +15,19 @@ jobs:
         uses: actions/checkout@v7
       - name: Build
         run: |
-          cmake -DCMAKE_BUILD_TYPE=Release .
+          mkdir laserkombat && cd laserkombat
+          cmake -DCMAKE_BUILD_TYPE=Release ..
           make
           strip --strip-unneeded laserkombat
+          cp ../COPYING ./
       - name: Publish artifacts
         uses: actions/upload-artifact@v7
         with:
           name: laserkombat-linux
           path: |
-            laserkombat
-            assets
-            COPYING
+            laserkombat/laserkombat
+            laserkombat/assets
+            laserkombat/COPYING
 
   Windows:
     runs-on: windows-latest
@@ -50,17 +52,19 @@ jobs:
         uses: actions/checkout@v7
       - name: Build
         run: |
-          cmake -DCMAKE_BUILD_TYPE=Release -G "MinGW Makefiles" .
+          mkdir laserkombat && cd laserkombat
+          cmake -DCMAKE_BUILD_TYPE=Release -G "MinGW Makefiles" ..
           cmake --build .
           strip --strip-unneeded laserkombat.exe
+          cp ../COPYING ./
       - name: Publish artifacts
         uses: actions/upload-artifact@v7
         with:
           name: laserkombat-windows
           path: |
-            laserkombat.exe
-            assets
-            COPYING
+            laserkombat/laserkombat.exe
+            laserkombat/assets
+            laserkombat/COPYING
 
   PSP:
     runs-on: ubuntu-latest

CMakeLists.txt

@@ -1,5 +1,9 @@
 cmake_minimum_required(VERSION 3.16)
 
+if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
+  message(FATAL_ERROR "Please create a build directory. Building inside the oceanpop directory directly would prevent the asset directory from being build correctly.")
+endif()
+
 project(laserkombat)
 
 include(FindPkgConfig)