Adjust build script, to avoid comparing the current files with main branch at all times

Author: ChristianH99

.github/workflows/build_files.yml

@@ -23,6 +23,8 @@ jobs:
         id: changed-files
         uses: dorny/paths-filter@v2
         with:
+          # Compare to the last commit (GITHUB_SHA refers to the latest commit)
+          base: ${{ github.sha }}
           filters: |
             entry_rules:
               - 'onstage_entry_rules/**'