🌱 Increase ulimit nofiles on image-build.yaml (#1746)

Builds keep failing with EMFILE errors, so follow the advice from a
similar issue work around:
npm/cli#4783 (comment)

---------

Signed-off-by: Scott Dickerson <sdickers@redhat.com>

.github/workflows/image-build.yaml

@@ -21,6 +21,7 @@ jobs:
  image_name: "tackle2-ui"
  containerfile: "./Dockerfile"
  architectures: '[ "amd64", "arm64", "ppc64le", "s390x" ]'
+ extra-args: "--ulimit nofile=4096:4096"
  secrets:
  registry_username: ${{ secrets.QUAY_PUBLISH_ROBOT }}
  registry_password: ${{ secrets.QUAY_PUBLISH_TOKEN }}