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 91e9f4ccb672bde595aac06171275f0e4c72d597..9527a536d0583cb64ec529e45593ef37e32c36f0 100644 (file)
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -10,7 +10,7 @@ on:
       - 'tests/plugins/filter/**.py'
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: [3.6, 3.7, 3.8]