github: Enable UBSAN for PR workflow

Given we were already enabling ASAN and there were a couple of UBSAN
bugs, let's enable UBSAN too.

Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

Author: amboar

.github/workflows/pr.yml

@@ -18,7 +18,7 @@ jobs:
         run: pip install --user -r tests/requirements.txt
 
       - name: Configure mctp build
-        run: meson setup build -Db_sanitize=address
+        run: meson setup build -Db_sanitize=address,undefined
 
       - name: Build mctp
         run: meson compile -C build
@@ -52,7 +52,7 @@ jobs:
         run: pip install --user -r tests/requirements.txt
 
       - name: Configure mctp build
-        run: meson setup build -Db_sanitize=address
+        run: meson setup build -Db_sanitize=address,undefined
 
       - name: Build mctp
         run: meson compile -C build