fixup qdmanage runs with system python,

Author: jiridanek

.github/workflows/build.yaml

@@ -210,7 +210,10 @@ jobs:
       - name: Install Python runtime/test dependencies
         run: ${{matrix.python}} -m pip install tox quart selectors h2 grpcio protobuf websockets pytest
 
-      - name: Install qpid-proton python wheel
+      - name: Replace /usr/bin/python3 with ${{matrix.python}}, for tools such as qdmanage
+        run: sudo ln -sf ${{matrix.python}} /usr/bin/python3
+
+      - name: Install qpid-proton python wheel (python3-dbg)
         run: ${{matrix.python}} -m pip install ${ProtonBuildDir}/python/pkgs/python_qpid_proton*.whl
 
       - name: CTest