github-ci: enable asan for Ubuntu debug-validation test

.github/workflows/builds.yml

@@ -1436,7 +1436,12 @@ jobs:
           chmod 755 $HOME/.cargo/bin/cbindgen
           echo "$HOME/.cargo/bin" >> $GITHUB_PATH
       - run: ./autogen.sh
-      - run: CFLAGS="${DEFAULT_CFLAGS}" ./configure --enable-debug-validation
+      - run: ./configure --enable-debug-validation
+        env:
+          CFLAGS: "${{ env.DEFAULT_CFLAGS }} -Wshadow -fsanitize=address -fno-omit-frame-pointer"
+          LDFLAGS: "-fsanitize=address" 
+          ac_cv_func_malloc_0_nonnull: "yes"
+          ac_cv_func_realloc_0_nonnull: "yes"
       - run: make -j2
       - run: make check
       - name: Extracting suricata-verify