fix(ci): Dont run functional tests if changing patch series

Currently, we often get stuck with the problem where something in the
host kernel breaks that causes functional tests to fail, but we cannot
update the patch series from which the host kernel gets built, because
functional tests are failing. Break this cyclic dependency by simply not
running functional tests when updating only the patch series (as they
dont test the updated kernel anyway.

Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

Author: roypat

.buildkite/common.py

@@ -118,10 +118,12 @@ def run_all_tests(changed_files):
     """
 
     # run the whole test suite if either of:
-    # - any file changed that is not documentation nor GitHub action config file
+    # - any file changed that is not documentation nor GitHub action config file, nor secret hiding patch series
     # - no files changed
     return not changed_files or any(
-        x.suffix != ".md" and not (x.parts[0] == ".github" and x.suffix == ".yml")
+        x.suffix != ".md"
+        and not (x.parts[0] == ".github" and x.suffix == ".yml")
+        and x.parts[1] != "hiding_ci"
         for x in changed_files
     )