fix: write the gardener kubeconfig to a file

Author: reshnm

hack/integration-test-runner.sh

@@ -7,11 +7,15 @@
 set -o nounset
 set -o pipefail
 
-GARDENER_KUBECONFIG_PATH=$1
+GARDENER_KUBECONFIG=$1
 NAMESPACE=$2
 VERSION=$3
 PR_ID=$4
 
+GARDENER_KUBECONFIG_PATH="$(mktemp -d)/gardener.kubeconfig"
+echo "$GARDENER_KUBECONFIG" > "$GARDENER_KUBECONFIG_PATH"
+chmod 600 "$GARDENER_KUBECONFIG_PATH"
+
 MAX_NUM_CLUSTERS=20
 NUM_CLUSTERS_START_DELETE_OLDEST=15
 DURATION_FOR_CLUSTER_DELETION=48h