CI: Enable colored output with FORCE_COLOR

Author: effigies

.github/workflows/test.yml

@@ -26,6 +26,10 @@ defaults:
   run:
     shell: bash
 
+# Force tox and pytest to use color
+env:
+  FORCE_COLOR: true
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true