eval: run on ubuntu-slim

ubuntu-slim has faster start time, has less cores, but allows more jobs
per github organization.

Signed-off-by: Jörg Thalheim <joerg@thalheim.io>

Author: Mic92

.github/workflows/eval.yml

@@ -15,12 +15,12 @@ permissions:
 
 jobs:
     eval:
-        runs-on: ubuntu-latest
+        runs-on: ubuntu-slim
         timeout-minutes: 120
         strategy:
             fail-fast: false
             matrix:
-                jobid: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+                jobid: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
         concurrency:
             # Cancel any in-progress workflow runs from the same PR or branch,
             # allowing matrix jobs to run concurrently: