Add fail-fast: false

Co-authored-by: Hugo van Kemenade <[email protected]>

Author: zware

.github/workflows/build.yml

@@ -11,6 +11,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         python-version:
           - '3.9'