ci: k8s: Install bats on GARM runners

GARM runners do not come with the whole set of tools we need, or are
used to when it comes to the GHA runners, so we need to manually install
bats on those.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

.github/workflows/run-k8s-tests-on-garm.yaml

@@ -55,6 +55,9 @@ jobs:
       - name: Deploy Kata
         timeout-minutes: 10
         run: bash tests/integration/kubernetes/gha-run.sh deploy-kata-tdx
+
+      - name: Install `bats`
+        run: bash tests/integration/kubernetes/gha-run.sh install-bats
   
       - name: Run tests
         timeout-minutes: 30