Make fail-fast=true explicit

Requested by Shahzad in a prior PR so that we are not reliant on github preserving it's current defaults.  I also find it handy as it makes changing it to false for temp testing a fair bit easier.

.github/workflows/test-and-upload-coverage.yml

@@ -28,6 +28,7 @@ jobs:
     name: Run tests matrix job
 
     strategy:
+      fail-fast: true
       matrix:
         os: [ubuntu-latest]
         client-type: [go, http, cli]