fix: add GitHub server check to workflows and streamline CMake installation

.github/workflows/cmake.yml

@@ -19,6 +19,8 @@ on:
 
 jobs:
   build:
+    # Only run on GitHub, skip on Gitea
+    if: github.server_url == 'https://github.com'
     # The CMake configure and build commands are platform agnostic and should work equally well on Windows or Mac.
     # You can convert this to a matrix build if you need cross-platform coverage.
     # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
@@ -39,12 +41,7 @@ jobs:
     #   make && make install INSTALL_INC=/usr/include/lua
       run: |
           sudo apt-get update
-          sudo apt-get install -y build-essential libglfw3-dev libglfw3 libglew-dev libglm-dev libpng-dev libopenal-dev libluajit-5.1-dev libvorbis-dev libgtest-dev libcurl4-openssl-dev wget
-          # Install CMake >= 3.26
-          wget https://github.com/Kitware/CMake/releases/download/v3.27.9/cmake-3.27.9-linux-x86_64.sh
-          chmod +x cmake-3.27.9-linux-x86_64.sh
-          sudo ./cmake-3.27.9-linux-x86_64.sh --skip-license --prefix=/usr/local
-          rm cmake-3.27.9-linux-x86_64.sh
+          sudo apt-get install libglfw3-dev libglfw3 libglew-dev libglm-dev libpng-dev libopenal-dev libluajit-5.1-dev libvorbis-dev libgtest-dev libcurl4-openssl-dev
           # fix luajit paths
           sudo ln -s /usr/lib/x86_64-linux-gnu/libluajit-5.1.a /usr/lib/x86_64-linux-gnu/liblua-5.1.a
           sudo ln -s /usr/include/luajit-2.1 /usr/include/lua
@@ -78,4 +75,4 @@ jobs:
         name: VoxelEngine
         path: |
           VoxelEngine
-          res/*
+          res/*