Add compile flags for GCC builds

Author: DennisOSRM

.github/workflows/osrm-backend.yml

@@ -167,9 +167,9 @@ jobs:
       matrix:
         config:
           # standard builds
-          - { name: gcc-14, type: Release }
-          - { name: gcc-13, type: Release }
-          - { name: gcc-12, type: Release }
+          - { name: gcc-14, type: Release, CXXFLAGS: '-Wno-array-bounds -Wno-uninitialized' }
+          - { name: gcc-13, type: Release, CXXFLAGS: '-Wno-array-bounds -Wno-uninitialized' }
+          - { name: gcc-12, type: Release, CXXFLAGS: '-Wno-array-bounds -Wno-uninitialized' }
           - { name: clang-18, type: [Debug, Release] }
           - { name: clang-17, type: Release }
           - { name: clang-16, type: Release }
@@ -179,6 +179,7 @@ jobs:
             compiler: gcc-13
             type: Debug
             coverage: true
+            CXXFLAGS: '-Wno-array-bounds -Wno-uninitialized'
 
           - name: clang-18-debug-asan
             compiler: clang-18