github-ci: add debug validation to almalinux 10 build

After the distcheck, this build doesn't need unittests, so add
debug-validation, as this can trigger assertions in our lib examples
that are tested in this job

This triggers a debug-validation error in the custom library example.

Ticket: #8259

.github/workflows/builds.yml

@@ -159,6 +159,13 @@ jobs:
           MAKEFLAGS: "-j ${{ env.CPUS }}"
       - run: test -e doc/userguide/suricata.1
 
+      # Rebuild with debug-validation.
+      - name: Configuring
+        run: |
+          ./autogen.sh
+          CFLAGS="${DEFAULT_CFLAGS}" ./configure --enable-debug-validation
+          make -j ${{ env.CPUS }}
+
       - name: Building Rust documentation
         run: make doc
         working-directory: rust