ci: kata-deploy: Export KUBERNETES env var

So we have a better control on which flavour of kubernetes kata-deploy
is expected to be targetting.

This was also done as part of fa62a4c,
for the k8s tests.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>
(cherry picked from commit 9e1fb8a)

.github/workflows/run-kata-deploy-tests-on-aks.yaml

@@ -44,6 +44,7 @@ jobs:
       GH_PR_NUMBER: ${{ inputs.pr-number }}
       KATA_HOST_OS: ${{ matrix.host_os }}
       KATA_HYPERVISOR: ${{ matrix.vmm }}
+      KUBERNETES: "vanilla"
       USING_NFD: "false"
     steps:
       - uses: actions/checkout@v3

.github/workflows/run-kata-deploy-tests-on-tdx.yaml

@@ -36,6 +36,7 @@ jobs:
       DOCKER_TAG: ${{ inputs.tag }}
       PR_NUMBER: ${{ inputs.pr-number }}
       KATA_HYPERVISOR: ${{ matrix.vmm }}
+      KUBERNETES: "k3s"
       USING_NFD: "true"
     steps:
       - uses: actions/checkout@v3

tests/functional/kata-deploy/kata-deploy.bats

@@ -48,7 +48,7 @@ setup() {
 	echo "::endgroup::"
 
 	kubectl apply -f "${repo_root_dir}/tools/packaging/kata-deploy/kata-rbac/base/kata-rbac.yaml"
-	if [ "${platform}" = "tdx" ]; then
+	if [ "${KUBERNETES}" = "k3s" ]; then
 		kubectl apply -k "${repo_root_dir}/tools/packaging/kata-deploy/kata-deploy/overlays/k3s"
 	else
 		kubectl apply -f "${repo_root_dir}/tools/packaging/kata-deploy/kata-deploy/base/kata-deploy.yaml"
@@ -74,7 +74,7 @@ setup() {
 teardown() {
 	kubectl get runtimeclasses -o name | grep -v "kata-mshv-vm-isolation"
 
-	if [ "${platform}" = "tdx" ]; then
+	if [ "${KUBERNETES}" = "k3s" ]; then
 		deploy_spec="-k "${repo_root_dir}/tools/packaging/kata-deploy/kata-deploy/overlays/k3s""
 		cleanup_spec="-k "${repo_root_dir}/tools/packaging/kata-deploy/kata-cleanup/overlays/k3s""
 	else