workflows: don't fail-fast the build step (#1765)

It's not infrequent when one of the jobs hits the infrastructure
timeout, fails and then GH cancels other build jobs, even if they didn't
hit such an infrastructure issue (and could continue to be executed,
finishing the build). Change fail-fast for the non-warm-up build step to
false to let other jobs to finish (or to fail miserably).

Author: ricardosalveti

.github/workflows/build-yocto.yml

@@ -136,7 +136,7 @@ jobs:
     outputs:
       url: ${{ steps.compile_kas.outputs.url }}
     strategy:
-      fail-fast: true
+      fail-fast: false
       matrix:
         machine:
           - glymur-crd