ci: use for short workflows ubuntu-slim as gha image

Author: LizenzFass78851

.github/workflows/gen_md_files.yml

@@ -15,7 +15,7 @@ env:
 
 jobs:
   generate-and-deploy:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim # Use "ubuntu-latest" if the generated scripts you are using take longer than 15 minutes to run.
 #    if: github.repository == ''
     steps: