ci: Fix CMAKE_FLAGS by using direct cmake command

- Remove the problematic CMAKE_FLAGS variable that was causing argument parsing issues
- Put the cmake command directly in the script section with proper quotes
- This resolves the 'Unknown argument -mtune=core2' CMake error
- The YAML folded scalar was not properly separating the arguments
- Back to the working inline approach that was successful before

.gitlab-ci.yml

@@ -9,21 +9,6 @@ variables:
   CMAKE_BUILD_PARALLEL_LEVEL: "4"
   DOCKER_DRIVER: overlay2
   DOCKER_TLS_CERTDIR: ""
-  # Define CMAKE_FLAGS here to avoid YAML parsing issues
-  CMAKE_FLAGS: >
-    -GNinja
-    -DCITRON_ENABLE_LTO=ON
-    -DCITRON_USE_BUNDLED_VCPKG=ON
-    -DCITRON_TESTS=OFF
-    -DCITRON_USE_LLVM_DEMANGLE=OFF
-    -DCMAKE_INSTALL_PREFIX=/usr
-    -DCMAKE_CXX_FLAGS=-march=core2 -mtune=core2 -Wno-error
-    -DCMAKE_C_FLAGS=-march=core2 -mtune=core2
-    -DUSE_DISCORD_PRESENCE=OFF
-    -DBUNDLE_SPEEX=ON
-    -DCMAKE_SYSTEM_PROCESSOR=x86_64
-    -DCMAKE_BUILD_TYPE=Release
-    -DCMAKE_POLICY_VERSION_MINIMUM=3.5
 
 # Cache configuration for faster builds
 cache:
@@ -66,7 +51,7 @@ build-linux:
   script:
     - git submodule update --init --recursive
     - mkdir -p build && cd build
-    - cmake .. $CMAKE_FLAGS
+    - cmake .. -GNinja -DCITRON_ENABLE_LTO=ON -DCITRON_USE_BUNDLED_VCPKG=ON -DCITRON_TESTS=OFF -DCITRON_USE_LLVM_DEMANGLE=OFF -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_CXX_FLAGS="-march=core2 -mtune=core2 -Wno-error" -DCMAKE_C_FLAGS="-march=core2 -mtune=core2" -DUSE_DISCORD_PRESENCE=OFF -DBUNDLE_SPEEX=ON -DCMAKE_SYSTEM_PROCESSOR=x86_64 -DCMAKE_BUILD_TYPE=Release -DCMAKE_POLICY_VERSION_MINIMUM=3.5
     - ninja
     - cd ..
     - echo "Build completed, checking for executables..."