fix: add environment variables to override CXXFLAGS in GitHub Actions

Author: Omer Bulut

.github/workflows/ci.yml

@@ -156,6 +156,9 @@ jobs:
     name: Parallel Testing & Performance Analysis
     runs-on: ubuntu-latest
     timeout-minutes: 30
+    env:
+      CXX: g++
+      CXXFLAGS: -std=c++17 -Wall -Wextra -O2 -g
 
     steps:
     - name: Checkout code
@@ -172,7 +175,6 @@ jobs:
     - name: Build All Tests
       run: |
         echo "🔨 Building all test executables..."
-        export CXX=g++
         make clean
         make all
         
@@ -244,6 +246,9 @@ jobs:
     name: Build Cache Analysis
     runs-on: ubuntu-latest
     timeout-minutes: 10
+    env:
+      CXX: g++
+      CXXFLAGS: -std=c++17 -Wall -Wextra -O2 -g
 
     steps:
     - name: Checkout code
@@ -266,8 +271,6 @@ jobs:
         ./scripts/build_cache_manager.sh init || echo "⚠️ Cache initialization failed (continuing...)"
         
         # Build multiple times to test cache effectiveness
-        export CXX=g++
-        
         echo "🔨 First build (cache miss)..."
         make clean
         make all || echo "⚠️ First build failed (continuing...)"