.github: workflows: test: install curl before nrfutil setup

Add `curl` install step since it may not be available in the
runner environment when downloading nrfutil.

Signed-off-by: Simen S. Røstad <simen.rostad@nordicsemi.no>

Author: simensrostad

.github/workflows/test.yml

@@ -113,6 +113,7 @@ jobs:
       - name: Install nrfutil
         run: |
           set -eu
+          apt-get update && apt-get install --no-install-recommends -y curl
           work_dir="$(mktemp -d)"
           curl -fsSL \
             https://files.nordicsemi.com/artifactory/swtools/external/nrfutil/executables/x86_64-unknown-linux-gnu/nrfutil \