Update CI test configurations

- Limit test-results step to 1 min in case a test hangs without
  generating a tapfile, as `make test-results` may re-run it.
- Limit Appveyor tests to 20 mins.
- Always run `make test-results` on GHA.

.appveyor.yml

@@ -111,7 +111,7 @@ test_script:
 
 on_finish:
   - ps: Get-ChildItem *.tap -Recurse -Force | % { Push-AppveyorArtifact $_.FullName -FileName $_.Name }
-  - cmd: python .ci/cue.py build test-results -s
+  - cmd: python .ci/cue.py -T 1M test-results
 
 on_failure:
   - cmd: python -m ci_core_dumper report