fix: ci optional run for python 3.8

Author: marceljk

.github/workflows/ci.yaml

@@ -2,9 +2,13 @@ name: CI Workflow
 
 on: [pull_request, workflow_dispatch]
 
+env:
+  OPTIONAL_PYTHON_VERSIONS: '["3.8"]' # new services will support >= python 3.9
+
 jobs:
   main:
     name: CI
+    continue-on-error: ${{ contains(fromJson(env.OPTIONAL_PYTHON_VERSIONS), matrix.python-version) }}
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]