Enable UBSan sanitizer on CI

Author: bnoordhuis

.github/workflows/ci.yml

@@ -43,6 +43,13 @@ jobs:
       - name: test
         run: |
           make -j$(getconf _NPROCESSORS_ONLN) CONFIG_WERROR=y CONFIG_MSAN=y CONFIG_CLANG=y test
+  linux-ubsan:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: test
+        run: |
+          make -j$(getconf _NPROCESSORS_ONLN) CONFIG_WERROR=y CONFIG_UBSAN=y test
 
   macos:
     runs-on: macos-latest