CI: Add a check for building tools for PyPi

Add a simple check that the PyPi packages can be built.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e320a24..a891387 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -251,6 +251,12 @@
     # have no matches.
     - git grep u-boot,dm- -- '*.dts*' && exit 1 || exit 0
 
+# Check we can package the Python tools
+Check packing of Python tools:
+  stage: testsuites
+  script:
+    - make pip
+
 # Test sandbox with test.py
 sandbox test.py:
   variables: