Merge pull request #544 from lz-bro/debug-test-ubuntu-20.04

Use Ubuntu 20.04 for debug tests

Author: aap-sc

.github/workflows/spike-openocd-tests.yml

@@ -34,7 +34,7 @@ on:
 jobs:
   test:
     name: Test debug (Ubuntu)
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
         with: