github/workflows: run the funtionality test in ubuntu runner

Author: taodd

.github/workflows/pr-build.yaml

@@ -24,11 +24,14 @@ jobs:
             git submodule update --init --recursive
 
       - name: Run Makefile build
-        run: make -j all 
+        run: make -j all
 
       - name: Unit test - verify dwarf output is consistent
         run: ./tests/dwarf-compare.sh
 
+      - name: Functional test - verify osdtrace and radostrace with MicroCeph
+        run: sudo ./tests/functional-test-microceph.sh
+
   build-centos:
     runs-on: ubuntu-latest
     strategy: