ci: Improve formatting

This makes it easier to add or remove items from the matrix.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

.github/workflows/ci.yaml

@@ -7,9 +7,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: [ "3.8", "3.9", "3.10" ]
-        os: [ ubuntu-20.04 ]
-
+        os:
+          - ubuntu-20.04
+        python:
+          - "3.8"
+          - "3.9"
+          - "3.10"
     runs-on: ${{ matrix.os }}
 
     steps: