Do not cancel other jobs when ppc64le build fails (#623)

Author: nforro

.github/workflows/base-image-rebuild.yml

@@ -18,6 +18,7 @@ jobs:
     name: Build and push image
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         include:
           - containerfile: containers/Containerfile