tests: pin ubuntu 20.04 version in github action for pytest

3.6 has reached EOL and is no longer supported in newer ubuntu releases.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 20f1edba416c45eb7b5ad2db4aa7a7564ba992da..403ed8ea6faa42c7fe9088f117cf073f83280858 100644 (file)
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -8,7 +8,7 @@ on:
       - 'tests/plugins/filter/**.py'
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: [2.7, 3.6]