Run as many CI jobs as possible when one fails

The other matrixes should not have this problem, so only touch unix testing

.github/workflows/testing.yml

@@ -11,6 +11,7 @@ jobs:
           - os: ubuntu-18.04
             cc: gcc
             target: develop
+      fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2