Add CMake controls

.github/workflows/build-tex.yml

@@ -17,4 +17,11 @@ jobs:
     - name: Install TeX Live
       uses: zauguin/install-texlive@v3
       with:
-        package_file: .github/tl_packages
+        package_file: .github/tl_packages
+
+    - name: Configure CMake
+      run: |
+        cmake -B ${{github.workspace}}/build -DBUILD_DOCS=ON -DBUILD_PROG=OFF
+    
+    - name: Build
+      run: cmake --build ${{github.workspace}}/build

src/CMakeLists.txt

@@ -1,4 +1,12 @@
 cmake_minimum_required(VERSION 3.17)
 
-add_subdirectory(群友提交)
-add_subdirectory(PDF版题目与答案)
+option(BUILD_DOCS "Build TeX docs" OFF)
+option(BUILD_PROG "Build programs" ON)
+
+if(BUILD_PROG)
+    add_subdirectory(群友提交)
+endif()
+
+if(BUILD_DOCS)
+    add_subdirectory(PDF版题目与答案)
+endif()