ci: Add --with-realtime=uspace

Default ist RTAI. No issue so far but when RTAI, this is built

Author: hdiethelm

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
     - name: Build RIP GCC
       run: |
         set -x
-        .github/scripts/build-rip.sh
+        .github/scripts/build-rip.sh --with-realtime=uspace
     - name: Verify no untracked or modified files after build
       run: |
         .github/scripts/verify-clean-repo.sh
@@ -100,7 +100,7 @@ jobs:
     - name: Build RIP Clang
       run: |
         set -x
-        CC=clang CXX=clang++ .github/scripts/build-rip.sh
+        CC=clang CXX=clang++ .github/scripts/build-rip.sh --with-realtime=uspace
     - name: Verify no untracked or modified files after build
       run: |
         .github/scripts/verify-clean-repo.sh