Revert "Merge pull request #5301 from KrystalDelusion/krys/re_5280"

This reverts commit c9a602e882, reversing
changes made to 51eaaffe09.

.github/workflows/test-compile.yml

@@ -1,14 +1,6 @@
 name: Compiler testing
 
-on:
-  # always test main
-  push:
-    branches:
-      - main
-  # test PRs
-  pull_request:
-  # allow triggering tests, ignores skip check
-  workflow_dispatch:
+on: [push, pull_request]
 
 jobs:
   pre_job:
@@ -19,11 +11,11 @@ jobs:
       - id: skip_check
         uses: fkirc/skip-duplicate-actions@v5
         with:
-          # don't run on documentation changes
           paths_ignore: '["**/README.md", "docs/**", "guidelines/**"]'
           # cancel previous builds if a new commit is pushed
-          # but never cancel main
-          cancel_others: ${{ github.ref != 'refs/heads/main' }}
+          cancel_others: 'true'
+          # only run on push *or* pull_request, not both
+          concurrent_skipping: 'same_content_newer'
 
   test-compile:
     runs-on: ${{ matrix.os }}