Instead of converting failures to warnings, run cleanup "always"

.gitlab-ci-unix.yml

@@ -693,3 +693,4 @@ spec:
   script:
     - rm -rf "/tmp/gitlab-runner/$[[ inputs.os ]]-$[[ inputs.platform ]]-${CI_PIPELINE_ID}"
   dependencies: []
+  when: always

.gitlab-ci.yml

@@ -15,7 +15,6 @@ stages:
       - ctrl/text.dat
       - xtrn/**/{GNUm,M}akefile
       - xtrn/**/*.{c,h,cpp,hpp,mk}
-  allow_failure: true
 
 include:
   - local: '.gitlab-ci-unix.yml'